[7.x] [Fleet] Stop loading js-yaml in main plugin bundle (#111169)

[kibanamachine]

Backports the following commits to 7.x:

• [Fleet] Stop loading js-yaml in main plugin bundle ([Fleet] Stop loading js-yaml in main plugin bundle #111169)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 139760a
• Storybooks Preview

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
fleet	1066	1069	+3

Async chunks

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

id	before	after	diff
fleet	800.1KB	1020.4KB	⚠️ +220.4KB

Page load bundle

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

id	before	after	diff
fleet	454.7KB	234.8KB	-220.0KB

Unknown metric groups

API count

id	before	after	diff
fleet	1167	1170	+3

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

cc @joshdover