[7.x] Rule registry bundle size (#97251)

[dgieselaar]

Backports the following commits to 7.x:

• Rule registry bundle size (Rule registry bundle size #97251)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 791af65
• Storybooks Preview

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
apm	1574	1575	+1
ruleRegistry	17	5	-12
total			-11

Async chunks

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

id	before	after	diff
apm	4.1MB	4.2MB	+51.1KB
observability	447.2KB	447.6KB	+416.0B
total			+51.5KB

Page load bundle

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

id	before	after	diff
apm	53.5KB	29.4KB	-24.1KB
observability	39.0KB	38.5KB	-524.0B
ruleRegistry	90.8KB	3.4KB	-87.4KB
total			-112.0KB

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