Fix spacing in popovers in Rule Detail and Alert Detail as a result of Eui spacing updates

[CoenWarmer]

Resolves #145987

Summary

This fixes spacing in the popovers in Rule Detail and Alert Detail header actions components.

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 5e51cc8

Metrics [docs]

Async chunks

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

id	before	after	diff
observability	495.9KB	495.8KB	-138.0B

Unknown metric groups

ESLint disabled in files

id	before	after	diff
osquery	1	2	+1

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	19	21	+2
fleet	59	65	+6
osquery	109	115	+6
securitySolution	443	449	+6
total			+20

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	20	22	+2
fleet	68	74	+6
osquery	110	117	+7
securitySolution	520	526	+6
total			+21

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