Reorganize new/existing pipeline management screens into tabs

[Mikep86]

Summary

Split Configure step’s components in pipeline creation into two tabs:

• Create new: pipeline name, model selection
• Use existing: pipeline selection

Keep the split components' content as-is, they are out of scope for this task.

Remove the left hand side panels (“Create or select a pipeline”, “Select a trained ML Model” and blurbs underneath), and make the tab full width.

Also remove the ELSER text expansion callout from the flyout.

Checklist

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• 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

For maintainers

• This was checked for breaking API changes and was labeled appropriately

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: ce0ff10

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
enterpriseSearch	2.6MB	2.6MB	-1.8KB

History

• 💔 Build #179332 failed 528ed93

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

[efegurkan]

LGTM!

Please add team label too. Also you don't need backport:skip all you need is version labels. CI will figure backports from them.

[kderusso]

LGTM

[demjened]

LGTM