[7.x] [Cases] Performance and RBAC improvements (#101465)

[cnasikas]

Backports the following commits to 7.x:

• [Cases] Performance and RBAC improvements ([Cases] Performance and RBAC improvements #101465)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 69f618b
• Storybooks Preview

Metrics [docs]

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	382	381	-1

Page load bundle

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

id	before	after	diff
cases	132.1KB	132.3KB	+228.0B

Unknown metric groups

API count

id	before	after	diff
cases	407	406	-1

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@elasticmachine merge upstream