[Maps] add ungroup layers action

[nreese]

follow up to #142528

PR adds "Ungroup layers" to layer groups action menu, allowing users a quick option to remove layer group and keep layers in it.

[nreese]

@elasticmachine merge upstream

[elasticmachine]

Pinging @elastic/kibana-presentation (Team:Presentation)

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 28cdf22

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
maps	2.7MB	2.7MB	+450.0B

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	58	64	+6
osquery	108	113	+5
securitySolution	440	446	+6
total			+19

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	20	22	+2
fleet	66	72	+6
osquery	109	115	+6
securitySolution	517	523	+6
total			+20

History

• 💛 Build #85345 was flaky ecb5e66
• 💔 Build #85329 failed c6732db

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

[nickpeihl]

lgtm!

code review and tested in chrome