[7.x] [ML] Performance improvements to annotations editing in Single Metric Viewer & buttons placement (#83216)

[qn895]

Backports the following commits to 7.x:

• [ML] Performance improvements to annotations editing in Single Metric Viewer & buttons placement ([ML] Performance improvements to annotations editing in Single Metric Viewer & buttons placement #83216)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: aaea3a1

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
ml	1565	1566	+1

Async chunks

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

id	before	after	diff
ml	5.2MB	5.2MB	+3.9KB

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