- adds langsmith to transformIgnorePatterns in `packages/kbn-test…

…/jest_integration_node/jest-preset.js` to resolve the following error:

```
Jest Integration Tests
src/core/server/integration_tests/saved_objects/migrations/group3
incompatible_cluster_routing_allocation retries the INIT action with a descriptive message when cluster settings are incompatible

Failures in tracked branches: 4
elastic#158318

Buildkite Job
https://buildkite.com/elastic/kibana-pull-request/builds/153873#018a3421-e8f1-48e5-afdf-43496e4d1b0d

Jest encountered an unexpected token

Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax.

Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration.

By default "node_modules" folder is ignored by transformers.

Here's what you can do:
 • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to enable it.
 • If you are trying to use TypeScript, see https://jestjs.io/docs/getting-started#using-typescript
 • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
 • If you need a custom transformation specify a "transform" option in your config.
 • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

You'll find more details and examples of these config options in the docs:
https://jestjs.io/docs/configuration
For information about custom transformations, see:
https://jestjs.io/docs/code-transformation

Details:

/var/lib/buildkite-agent/builds/kb-n2-4-spot-f55f234db461f53e/elastic/kibana-pull-request/kibana/node_modules/langsmith/dist/index.js:1
({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,jest){export { Client } from "./client.js";
```

packages/kbn-test/jest_integration_node/jest-preset.js

@@ -22,7 +22,7 @@ module.exports = {
   // An array of regexp pattern strings that are matched against, matched files will skip transformation:
   transformIgnorePatterns: [
     // since ESM modules are not natively supported in Jest yet (https://github.com/facebook/jest/issues/4842)
-    '[/\\\\]node_modules(?![\\/\\\\](langchain))[/\\\\].+\\.js$',
+    '[/\\\\]node_modules(?![\\/\\\\](langchain|langsmith))[/\\\\].+\\.js$',
   ],
   setupFilesAfterEnv: [
     '<rootDir>/packages/kbn-test/src/jest/setup/after_env.integration.js',