[7.x] [Fleet] Update agent listing for better status reporting (#84798)

[nchaulet]

Backports the following commits to 7.x:

• [Fleet] Update agent listing for better status reporting ([Fleet] Update agent listing for better status reporting #84798)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 85b54a4

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
fleet	450	453	+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	1.2MB	947.3KB	-232.0KB

Distributable file count

id	before	after	diff
default	47320	48080	+760

Page load bundle

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

id	before	after	diff
fleet	375.8KB	376.3KB	+542.0B

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