[Unified search] Support fields custom label on filter editor

[stratoula]

Summary

Closes #128101

Displays field custom labels on the Filter editor. Also the filter badges and the filter application modal are also using the custom label.

[stratoula]

@elastic/kibana-vis-editors I am adding you here as reviewers too (mostly for visibility) as it is related with the creation of filters from clicking on a chart.

[jloleysens]

Great work @stratoula , thanks for adding tests 👏🏻 . I did not test locally, but this code LGTM.

[jloleysens]

@elasticmachine merge upstream

[kibana-ci]

💚 Build Succeeded

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Metrics [docs]

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
data	2851	2854	+3

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
unifiedSearch	116.2KB	116.5KB	+238.0B

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
data	416.3KB	416.5KB	+234.0B

Unknown metric groups

API count

id	before	after	diff
data	3463	3466	+3

History

• 💚 Build #41357 succeeded 56d6cd6
• 💛 Build #40698 was flaky 38c5518
• 💚 Build #40059 succeeded 4dd5443
• 💚 Build #39710 succeeded eadba95
• 💚 Build #39334 succeeded 000c339
• 💚 Build #38997 succeeded f1b7463

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@elasticmachine merge upstream