[Fleet] Clean up unused installed_bundled installation status

[jen-huang]

Summary

Clean up InstalledBundled: 'installed_bundled' package installation status, which is unused elsewhere in the code but creates a small amount of confusion. We track install source (bundled vs registry) via a different property, install_source: bundled.

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 4f23490
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• Webpack Bundle Analyzer

Failed CI Steps

• Jest Tests #4

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	1275	1274	-1

Page load bundle

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

id	before	after	diff
fleet	90.4KB	90.4KB	-37.0B

Unknown metric groups

API count

id	before	after	diff
fleet	1394	1393	-1

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

cc @jen-huang