[8.0] [Fleet] implements new design for outputs UI (#118910)

[nchaulet]

Backports the following commits to 8.0:

• [Fleet] implements new design for outputs UI ([Fleet] implements new design for outputs UI #118910)

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 71a531d
• Storybooks Preview

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
fleet	536	544	+8

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
fleet	1130	1138	+8

Async chunks

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

id	before	after	diff
fleet	635.2KB	643.4KB	+8.2KB

Page load bundle

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

id	before	after	diff
fleet	105.3KB	106.6KB	+1.3KB

Unknown metric groups

API count

id	before	after	diff
fleet	1232	1240	+8

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