[7.x] [ML] Add debounce to the severity control update (#101581)

[kibanamachine]

Backports the following commits to 7.x:

• [ML] Add debounce to the severity control update ([ML] Add debounce to the severity control update  #101581)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: f3aac4b
• Storybooks Preview

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
ml	1757	1759	+2

Async chunks

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

id	before	after	diff
ml	5.9MB	5.9MB	+1.6KB

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

cc @darnautov