[7.x] [Fleet] Tighten policy permissions, take II (#97366)

[kibanamachine]

Backports the following commits to 7.x:

• [Fleet] Tighten policy permissions, take II ([Fleet] Tighten policy permissions, take II #97366)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: e82c11e
• 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	981	985	+4

Page load bundle

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

id	before	after	diff
fleet	425.1KB	425.2KB	+49.0B

Unknown metric groups

API count

id	before	after	diff
fleet	1071	1075	+4

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

cc @afgomez