[7.x] Add telemetry for Elastic Cloud (#102390)

[kibanamachine]

Backports the following commits to 7.x:

• Add telemetry for Elastic Cloud (Add telemetry for Elastic Cloud #102390)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: d6dca3f
• Storybooks Preview

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
cloud	8	13	+5

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
cloud	20	21	+1

Async chunks

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

id	before	after	diff
cloud	0.0B	17.1KB	+17.1KB

Page load bundle

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

id	before	after	diff
cloud	5.4KB	8.7KB	+3.3KB

Unknown metric groups

API count

id	before	after	diff
cloud	20	21	+1

async chunk count

id	before	after	diff
cloud	0	1	+1

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

cc @joshdover