Move shared hooks and components to Observability Shared

[CoenWarmer]

Resolves #157848

📝 Summary

This PR copies hooks and components that are used in multiple Observability apps to the Observability Shared plugin.

In upcoming PRs we will update the imports in Obs apps to their new location in Obs Shared. Then finally, when all apps are updated, we will remove the ones in Observability.

More information in the ticket description.

✅ Acceptance criteria

• Everything should work as before.

[apmmachine]

🤖 GitHub comments

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• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
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[shahzad31]

LGTM !!

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: a34c12e

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
observabilityShared	109	121	+12

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
observabilityShared	216	265	+49

Async chunks

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

id	before	after	diff
observabilityShared	34.5KB	35.9KB	+1.3KB

Page load bundle

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

id	before	after	diff
observabilityShared	37.3KB	41.5KB	+4.2KB

Unknown metric groups

API count

id	before	after	diff
observabilityShared	217	266	+49

async chunk count

id	before	after	diff
observabilityShared	2	3	+1

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	19	21	+2
observabilityShared	6	7	+1
securitySolution	400	404	+4
total			+7

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	20	22	+2
observabilityShared	6	7	+1
securitySolution	480	484	+4
total			+7

History

• 💔 Build #128134 failed 155f74120af06be3d88f3498e8acfb678f8b2cd2

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