[Tech Debt] Reorder Alerts page

[CoenWarmer]

Resolves #152788

Summary

This PR updates the Alerts Page to follow the newly agreed upon structure for the Observability app.

This PR is part of a larger effort to have all pages in the Observability app follow the same structure so they are more consistent with each other. More details in the epic: #152783

It also cleans up dead and unused components where found.

All design and functionality should be exactly the same as before.

---

Old folder structure:

New folder structure:
Page

Root/components

Checklist

• Rename page component <to_name_of_page.tsx>
• Remove /container subfolder if available
• Try to inline translations in /translations.ts
• Try to move re-used components to /app_root/components/feature
• Try to move components that are only used in Page to /page/<name_of_page>/components/<component_name>.tsx

[elasticmachine]

Pinging @elastic/apm-ui (Team:APM)

[CoenWarmer]

@elasticmachine merge upstream

[CoenWarmer]

@elasticmachine merge upstream

[CoenWarmer]

@elasticmachine merge upstream

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 7a48977
• Storybooks Preview

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
observability	542	522	-20

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
observability	634	646	+12

Async chunks

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

id	before	after	diff
observability	1.1MB	1.1MB	-4.0KB

Page load bundle

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

id	before	after	diff
observability	88.8KB	88.8KB	+8.0B

Unknown metric groups

API count

id	before	after	diff
observability	640	652	+12

ESLint disabled line counts

id	before	after	diff
observability	54	50	-4
securitySolution	432	434	+2
total			-2

Total ESLint disabled count

id	before	after	diff
observability	60	56	-4
securitySolution	509	511	+2
total			-2

History

• 💛 Build #112887 was flaky fa93ad9
• 💔 Build #112875 failed ca242dc
• 💔 Build #112839 failed 416d50b
• 💔 Build #112833 failed ae05b20
• 💚 Build #112782 succeeded 761948e
• 💔 Build #112751 failed 9b7cb86

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

[sorenlouv]

apm changes lgtm

[simianhacker]

LGTM