[IndexPatterns] Clean up StubIndexPattern

[Dosant]

Summary

Close #78519

This pr cleans up a bit of unit tests code that uses StubIndexPattern exported from the data plugin.

What was done:

• Refactor old code away from sinon, use jest instead
• Originally I was thinking to provide an empty mock, but looking at how this was consumed, stub seemed more appropriate. so I left it as stub helpers. Now, this stub is a fully-featured IndexPattern instance.
• It provides not only the factories to create custom stubs, but also pre-created common ready-to-use stub index patterns. With time field, without, and also fully-featured logstash index pattern that is used in a bunch of Discover's and some other tests. All the /fixtures/logstash_fields.js were moved near the stub and I a bit restructured it for this.
• The stub factory is available both in common and in public code. The difference is that public code uses a real public field formats registry by default, whereas common use a dummy mock of it.

How to use:

Existing stub

import { stubIndexPattern } from 'src/plugins/data/common/stubs'; 

myApiThatExpectsIndexPattern(stubIndexPattern)

You can use jest.spyOn to track usage and provide mock implementation instead of creating a custom index pattern as a shortcut. Don't forget to reset mocks in your tests.

Custom stub

import { createStubIndexPattern } from 'src/plugins/data/common/stubs'; 

const stubIndexPattern = createStubIndexPattern({
  spec: { id: 'my-index', title: 'my-index', ...all other spec field },
  opts: {...},
  deps: {... can provide custom field formats implementation if needed}
});

myApiThatExpectsIndexPattern(stubIndexPattern)

[mattkime]

Looks great! Huge improvement. 🚀

[elasticmachine]

Pinging @elastic/kibana-app-services (Team:AppServices)

[Dosant]

@elasticmachine merge upstream

[Dosant]

@elasticmachine merge upstream

[justinkambic]

Exploratory view change LGTM!

[mattkime]

@elasticmachine merge upstream

[Dosant]

@elasticmachine merge upstream

[Dosant]

@elasticmachine merge upstream

[kertal]

LGTM, just tests affected so didn't checkout and test, Code review KibanaApp owned code

[Dosant]

@elasticmachine merge upstream

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 0904c6e
• Storybooks Preview
• Documentation Changes

Metrics [docs]

✅ unchanged

History

• 💚 Build #148079 succeeded 9eccfb0
• 💔 Build #147756 failed 9bfc0de
• 💛 Build #147553 was flaky f91a49e
• 💔 Build #147291 failed cda3465
• 💔 Build #147208 failed d0e3713

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[kibanamachine]

💚 Backport successful

Status	Branch	Result
✅	7.x

This backport PR will be merged automatically after passing CI.