Completed the first part which is the backend tests to run less than …

…600 megs (elastic#118734)

## Summary

This addresses parts of elastic#117255

By introducing top level mocks for:
* `core/server/index.ts`
* `task_manager/server/index.ts`
* `alerting/server/index.ts`
* `actions/server/index.ts`

These top level mocks add the few required functions we use sparingly and adds them from the "restricted zones" to avoid giant typescript imports from happening from the server side which also pulls in the memory leaks. 

```ts
moduleNameMapper: {
    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
    'task_manager/server$':
      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
  },
```

For testing this you can now run:
```sh
node --max-old-space-size=600 --expose-gc ./node_modules/.bin/jest --runInBand --logHeapUsage --detectOpenHandles --no-cache --config x-pack/plugins/security_solution/jest.config.dev.js x-pack/plugins/security_solution/server
```

And the server side tests will be able to complete in less than 600 megs of memory. The memory leaks and memory consumption issues are mitigated through the layers but this doesn't guarantee that in the future these won't show up again. The root of the issue(s) with the memory leaks from `core/server` aren't addressed here as those are separate concerns at this point but this at least mitigates the amount of leakage from our side for now.

### Checklist

- [x] [Unit or functional tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html) were updated or added to match the most common scenarios

x-pack/plugins/lists/server/services/exception_lists/delete_exception_list_items_by_list.ts

@@ -9,7 +9,7 @@ import type { ListId, NamespaceType } from '@kbn/securitysolution-io-ts-list-typ
 import { getSavedObjectType } from '@kbn/securitysolution-list-utils';
 import { asyncForEach } from '@kbn/std';
 
-import { SavedObjectsClientContract } from '../../../../../../src/core/server/';
+import { SavedObjectsClientContract } from '../../../../../../src/core/server';
 
 import { findExceptionListItem } from './find_exception_list_item';
 

x-pack/plugins/lists/server/services/exception_lists/get_exception_list.ts

@@ -16,7 +16,7 @@ import { getSavedObjectType } from '@kbn/securitysolution-list-utils';
 import {
   SavedObjectsClientContract,
   SavedObjectsErrorHelpers,
-} from '../../../../../../src/core/server/';
+} from '../../../../../../src/core/server';
 import { ExceptionListSoSchema } from '../../schemas/saved_objects';
 
 import { transformSavedObjectToExceptionList } from './utils';

x-pack/plugins/lists/server/services/exception_lists/get_exception_list_item.ts

@@ -16,7 +16,7 @@ import { getSavedObjectType } from '@kbn/securitysolution-list-utils';
 import {
   SavedObjectsClientContract,
   SavedObjectsErrorHelpers,
-} from '../../../../../../src/core/server/';
+} from '../../../../../../src/core/server';
 import { ExceptionListSoSchema } from '../../schemas/saved_objects';
 
 import { transformSavedObjectToExceptionListItem } from './utils';

x-pack/plugins/lists/server/services/exception_lists/get_exception_list_summary.ts

@@ -16,7 +16,7 @@ import { getSavedObjectType } from '@kbn/securitysolution-list-utils';
 import {
   SavedObjectsClientContract,
   SavedObjectsErrorHelpers,
-} from '../../../../../../src/core/server/';
+} from '../../../../../../src/core/server';
 import { ExceptionListSoSchema } from '../../schemas/saved_objects';
 
 interface GetExceptionListSummaryOptions {

x-pack/plugins/security_solution/common/jest.config.js

@@ -13,4 +13,12 @@ module.exports = {
     '<rootDir>/target/kibana-coverage/jest/x-pack/plugins/security_solution/common',
   coverageReporters: ['text', 'html'],
   collectCoverageFrom: ['<rootDir>/x-pack/plugins/security_solution/common/**/*.{ts,tsx}'],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/public/app/jest.config.js

@@ -13,4 +13,12 @@ module.exports = {
     '<rootDir>/target/kibana-coverage/jest/x-pack/plugins/security_solution/public/app',
   coverageReporters: ['text', 'html'],
   collectCoverageFrom: ['<rootDir>/x-pack/plugins/security_solution/public/app/**/*.{ts,tsx}'],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/public/cases/jest.config.js

@@ -13,4 +13,12 @@ module.exports = {
     '<rootDir>/target/kibana-coverage/jest/x-pack/plugins/security_solution/public/cases',
   coverageReporters: ['text', 'html'],
   collectCoverageFrom: ['<rootDir>/x-pack/plugins/security_solution/public/cases/**/*.{ts,tsx}'],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/public/common/jest.config.js

@@ -13,4 +13,12 @@ module.exports = {
     '<rootDir>/target/kibana-coverage/jest/x-pack/plugins/security_solution/public/common',
   coverageReporters: ['text', 'html'],
   collectCoverageFrom: ['<rootDir>/x-pack/plugins/security_solution/public/common/**/*.{ts,tsx}'],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/public/detections/jest.config.js

@@ -15,4 +15,12 @@ module.exports = {
   collectCoverageFrom: [
     '<rootDir>/x-pack/plugins/security_solution/public/detections/**/*.{ts,tsx}',
   ],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/public/hosts/jest.config.js

@@ -13,4 +13,12 @@ module.exports = {
     '<rootDir>/target/kibana-coverage/jest/x-pack/plugins/security_solution/public/hosts',
   coverageReporters: ['text', 'html'],
   collectCoverageFrom: ['<rootDir>/x-pack/plugins/security_solution/public/hosts/**/*.{ts,tsx}'],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/public/jest.config.js

@@ -15,4 +15,12 @@ module.exports = {
     '<rootDir>/target/kibana-coverage/jest/x-pack/plugins/security_solution/public',
   coverageReporters: ['text', 'html'],
   collectCoverageFrom: ['<rootDir>/x-pack/plugins/security_solution/public/**/*.{ts,tsx}'],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/public/management/jest.config.js

@@ -15,4 +15,12 @@ module.exports = {
   collectCoverageFrom: [
     '<rootDir>/x-pack/plugins/security_solution/public/management/**/*.{ts,tsx}',
   ],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/public/network/jest.config.js

@@ -13,4 +13,12 @@ module.exports = {
     '<rootDir>/target/kibana-coverage/jest/x-pack/plugins/security_solution/public/network',
   coverageReporters: ['text', 'html'],
   collectCoverageFrom: ['<rootDir>/x-pack/plugins/security_solution/public/network/**/*.{ts,tsx}'],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/public/overview/jest.config.js

@@ -13,4 +13,12 @@ module.exports = {
     '<rootDir>/target/kibana-coverage/jest/x-pack/plugins/security_solution/public/overview',
   coverageReporters: ['text', 'html'],
   collectCoverageFrom: ['<rootDir>/x-pack/plugins/security_solution/public/overview/**/*.{ts,tsx}'],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/public/resolver/jest.config.js

@@ -13,4 +13,12 @@ module.exports = {
     '<rootDir>/target/kibana-coverage/jest/x-pack/plugins/security_solution/public/resolver',
   coverageReporters: ['text', 'html'],
   collectCoverageFrom: ['<rootDir>/x-pack/plugins/security_solution/public/resolver/**/*.{ts,tsx}'],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/public/timelines/jest.config.js

@@ -15,4 +15,12 @@ module.exports = {
   collectCoverageFrom: [
     '<rootDir>/x-pack/plugins/security_solution/public/timelines/**/*.{ts,tsx}',
   ],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/public/transforms/jest.config.js

@@ -15,4 +15,12 @@ module.exports = {
   collectCoverageFrom: [
     '<rootDir>/x-pack/plugins/security_solution/public/transforms/**/*.{ts,tsx}',
   ],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/server/__mocks__/action.mock.ts

@@ -0,0 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+// See: https://github.com/elastic/kibana/issues/117255, this creates mocks to avoid memory leaks from kibana core.
+module.exports = {};

x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts

@@ -0,0 +1,19 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+// See: https://github.com/elastic/kibana/issues/117255, this creates mocks to avoid memory leaks from kibana core.
+
+import { parseDuration } from '../../../alerting/common/parse_duration';
+// We _must_ import from the restricted path or we pull in _everything_ including memory leaks from Kibana core
+// eslint-disable-next-line @kbn/eslint/no-restricted-paths
+import { ReadOperations, WriteOperations } from '../../../alerting/server/authorization';
+
+module.exports = {
+  parseDuration,
+  ReadOperations,
+  WriteOperations,
+};

x-pack/plugins/security_solution/server/__mocks__/core.mock.ts

@@ -0,0 +1,15 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+// See: https://github.com/elastic/kibana/issues/117255, this creates mocks to avoid memory leaks from kibana core.
+
+// We _must_ import from the restricted path or we pull in _everything_ including memory leaks from Kibana core
+// eslint-disable-next-line @kbn/eslint/no-restricted-paths
+import { SavedObjectsUtils } from '../../../../../src/core/server/saved_objects/service/lib/utils';
+module.exports = {
+  SavedObjectsUtils,
+};

x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts

@@ -0,0 +1,14 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+// See: https://github.com/elastic/kibana/issues/117255, this creates mocks to avoid memory leaks from kibana core.
+
+// eslint-disable-next-line @kbn/eslint/no-restricted-paths
+import { TaskStatus } from '../../../task_manager/server/task';
+module.exports = {
+  TaskStatus,
+};

x-pack/plugins/security_solution/server/client/jest.config.js

@@ -13,4 +13,12 @@ module.exports = {
     '<rootDir>/target/kibana-coverage/jest/x-pack/plugins/security_solution/server/client',
   coverageReporters: ['text', 'html'],
   collectCoverageFrom: ['<rootDir>/x-pack/plugins/security_solution/server/client/**/*.{ts,tsx}'],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/server/endpoint/jest.config.js

@@ -13,4 +13,12 @@ module.exports = {
     '<rootDir>/target/kibana-coverage/jest/x-pack/plugins/security_solution/server/endpoint',
   coverageReporters: ['text', 'html'],
   collectCoverageFrom: ['<rootDir>/x-pack/plugins/security_solution/server/endpoint/**/*.{ts,tsx}'],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/server/fleet_integration/jest.config.js

@@ -15,4 +15,12 @@ module.exports = {
   collectCoverageFrom: [
     '<rootDir>/x-pack/plugins/security_solution/server/fleet_integration/**/*.{ts,tsx}',
   ],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/server/jest.config.js

@@ -15,4 +15,12 @@ module.exports = {
     '<rootDir>/target/kibana-coverage/jest/x-pack/plugins/security_solution/server',
   coverageReporters: ['text', 'html'],
   collectCoverageFrom: ['<rootDir>/x-pack/plugins/security_solution/server/**/*.{ts,tsx}'],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };

x-pack/plugins/security_solution/server/lib/detection_engine/routes/__mocks__/request_context.ts

@@ -11,7 +11,11 @@ import { coreMock } from 'src/core/server/mocks';
 import { ActionsApiRequestHandlerContext } from '../../../../../../actions/server';
 import { AlertingApiRequestHandlerContext } from '../../../../../../alerting/server';
 import { rulesClientMock } from '../../../../../../alerting/server/mocks';
-import { actionsClientMock } from '../../../../../../actions/server/mocks';
+
+// See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+// We cannot import from "../../../../../../actions/server" directly here or we have a really bad memory issue. We cannot add this to the existing mocks we created, this fix must be here.
+// eslint-disable-next-line @kbn/eslint/no-restricted-paths
+import { actionsClientMock } from '../../../../../../actions/server/actions_client.mock';
 import { licensingMock } from '../../../../../../licensing/server/mocks';
 import { listMock } from '../../../../../../lists/server/mocks';
 import { ruleRegistryMocks } from '../../../../../../rule_registry/server/mocks';

x-pack/plugins/security_solution/server/lib/jest.config.js

@@ -13,4 +13,12 @@ module.exports = {
     '<rootDir>/target/kibana-coverage/jest/x-pack/plugins/security_solution/server/lib',
   coverageReporters: ['text', 'html'],
   collectCoverageFrom: ['<rootDir>/x-pack/plugins/security_solution/server/lib/**/*.{ts,tsx}'],
+  // See: https://github.com/elastic/kibana/issues/117255, the moduleNameMapper creates mocks to avoid memory leaks from kibana core.
+  moduleNameMapper: {
+    'core/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/core.mock.ts',
+    'task_manager/server$':
+      '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/task_manager.mock.ts',
+    'alerting/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/alert.mock.ts',
+    'actions/server$': '<rootDir>/x-pack/plugins/security_solution/server/__mocks__/action.mock.ts',
+  },
 };