[7.x] [Fleet] Display NOTICE.txt from package if it exists (#101663)

[kibanamachine]

Backports the following commits to 7.x:

• [Fleet] Display NOTICE.txt from package if it exists ([Fleet] Display NOTICE.txt from package if it exists #101663)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 67d3e5f
• Storybooks Preview

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
fleet	475	476	+1

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	1007	1009	+2

Async chunks

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

id	before	after	diff
fleet	710.7KB	713.8KB	+3.1KB

Unknown metric groups

API count

id	before	after	diff
fleet	1097	1099	+2

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

cc @nchaulet