[7.x] [Cases] Route: Get all alerts attach to a case (#101878)

[cnasikas]

Backports the following commits to 7.x:

• [Cases] Route: Get all alerts attach to a case ([Cases] Route: Get all alerts attach to a case #101878)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 1b598dd
• Storybooks Preview

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
cases	254	255	+1

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
cases	398	401	+3

Page load bundle

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

id	before	after	diff
cases	126.4KB	126.8KB	+372.0B

Unknown metric groups

API count

id	before	after	diff
cases	434	437	+3

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@elasticmachine merge upstream