[7.x] [Security Solution] update endpoint list api to support united index (#112758)

[kibanamachine]

Backports the following commits to 7.x:

• [Security Solution] update endpoint list api to support united index ([Security Solution] update endpoint list api to support united index #112758)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: de80867
• Storybooks Preview

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
securitySolution	2224	2225	+1

Async chunks

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

id	before	after	diff
securitySolution	6.4MB	6.4MB	+613.0B

Page load bundle

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

id	before	after	diff
fleet	237.8KB	238.0KB	+141.0B
securitySolution	209.9KB	210.0KB	+156.0B
total			+297.0B

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

cc @joeypoon