[7.x] [Security Solution][Case] Manual attach alert to a case (#82996)

[cnasikas]

Backports the following commits to 7.x:

• [Security Solution][Case] Manual attach alert to a case ([Security Solution][Case] Manual attach alert to a case #82996)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 6f56dde

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
securitySolution	2107	2109	+2

Async chunks

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

id	before	after	diff
securitySolution	8.2MB	8.2MB	+6.9KB

Distributable file count

id	before	after	diff
default	48049	48046	-3

Page load bundle

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

id	before	after	diff
securitySolution	210.9KB	210.8KB	-51.0B

Unknown metric groups

async chunk count

id	before	after	diff
securitySolution	22	21	-1

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@elasticmachine merge upstream