[8.0] [APM] Offer users upgrade to multi-metric job (#119980)

[kibanamachine]

Backports the following commits to 8.0:

• [APM] Offer users upgrade to multi-metric job ([APM] Offer users upgrade to multi-metric job #119980)

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 7bbb72d
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Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
apm	1170	1172	+2

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
ml	279	281	+2

Async chunks

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

id	before	after	diff
apm	2.7MB	2.8MB	+5.6KB
ml	3.5MB	3.5MB	-1.5KB
total			+4.1KB

Public APIs missing exports

Total count of every type that is part of your API that should be exported but is not. This will cause broken links in the API documentation system. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats exports for more detailed information.

id	before	after	diff
apm	44	45	+1

Page load bundle

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

id	before	after	diff
ml	37.7KB	38.4KB	+621.0B

Unknown metric groups

API count

id	before	after	diff
ml	283	285	+2

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

cc @dgieselaar