[Cases] Fix case view flaky tests (#160412)

## Summary

This PR fixes flaky tests in
`x-pack/plugins/cases/public/components/case_view/case_view_page.test.tsx`.
Some of them were converted to an e2e test as they were too slow to be
on a unit test.

Successful runs: 

-
a4ed839
(50 times)
-
82ccceb
(45 times)
-
43c47e6
(20 times)

Fixes: #149775,
#149776,
#149777,
#149778,
#149779,
#149780,
#149781,
#149782,
#153335,
#153336,
#149773,
#149774,
#149772,
#149771,
#149770,
#149769,
#151845,
#153336,
#153335

Flaky test runner:
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/2500

### Checklist

Delete any items that are not applicable to this PR.

- [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

### For maintainers

- [x] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

x-pack/plugins/cases/public/common/lib/kibana/kibana_react.mock.ts → x-pack/plugins/cases/public/common/lib/kibana/kibana_react.mock.tsx

@@ -30,6 +30,7 @@ interface StartServiceArgs {
 
 export const createStartServicesMock = ({ license }: StartServiceArgs = {}): StartServices => {
   const licensingPluginMock = licensingMock.createStart();
+  const triggersActionsUi = triggersActionsUiMock.createStart();
 
   const services = {
     ...coreMock.createStart(),
@@ -39,7 +40,11 @@ export const createStartServicesMock = ({ license }: StartServiceArgs = {}): Sta
       navigateToPrefilledEditor: jest.fn(),
     },
     security: securityMock.createStart(),
-    triggersActionsUi: triggersActionsUiMock.createStart(),
+    triggersActionsUi: {
+      actionTypeRegistry: triggersActionsUi.actionTypeRegistry,
+      alertsTableConfigurationRegistry: triggersActionsUi.alertsTableConfigurationRegistry,
+      getAlertsStateTable: jest.fn().mockReturnValue(<div data-test-subj="alerts-table" />),
+    },
     spaces: spacesPluginMock.createStartContract(),
     licensing:
       license != null