[ML] Adds support for ad-hoc Data Views for testing models in Trained Models UI

[darnautov]

Summary

Closes #177633

• Renames "Index" form control to "Data View"
• Enables users to create persistent/ad-hoc data view from the Test model flyout

Checklist

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Unit or functional tests were updated or added to match the most common scenarios
• Flaky Test Runner was used on any tests changed
• Any UI touched in this PR is usable by keyboard only (learn more about keyboard accessibility)
• Any UI touched in this PR does not create any new axe failures (run axe in browser: FF, Chrome)
• This renders correctly on smaller devices using a responsive layout. (You can test this in your browser)
• This was checked for cross-browser compatibility

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[joemcelroy]

Works fine for indices without data views

[peteharverson]

Tested latest edits with the flyout for creating data views and LGTM

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 1d839bc

Failed CI Steps

• FTR Configs #18

Test Failures

• [job] [logs] FTR Configs #18 / Agents fleet_list_agent should return correct status summary if showUpgradeable is provided

Metrics [docs]

Async chunks

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

id	before	after	diff
ml	4.1MB	4.1MB	+596.0B

History

• 💛 Build #204021 was flaky 6ff569b
• 💚 Build #203715 succeeded e6e91e20166a8cc98b8ac824461b323598a0c877
• 💔 Build #203641 failed 18c6cbb8636a8d5152440d9f7f7b144711ce9c69

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

cc @darnautov

[serenachou]

LGTM!

This is fine for 8.14 to try it out - it's certainly better than no call to action to create the dependency!
So the takeaways are : there's a new dropdown for Data Views and the customer can select one or create one and when clicking the Create Data View it slides out the normal flyout for creation.
If that's correct - that matches exactly what I needed to make that dependency more clear. Thank you!