[Fleet] Display NOTICE.txt from package if it exists

[nchaulet]

Summary

Resolve #100351
The package registry recently introduced NOTICE.txt file (elastic/package-spec#151)

That PR display a link to the NOTICE.txt and show the content of the file inside a modal in the package details view

Currently only the security detection rule package use that file

UI Changes

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[nchaulet]

@elasticmachine merge upstream

[nchaulet]

@elasticmachine merge upstream

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: a0d432c
• 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

History

• 💚 Build #130654 succeeded a14b432
• 💚 Build #129934 succeeded 2a43396

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

cc @nchaulet

[kibanamachine]

💚 Backport successful

Status	Branch	Result
✅	7.x

This backport PR will be merged automatically after passing CI.