[8.x] [ML][Rules] Fixes deletion in Check interval input for anomaly detection rule (#193420)

[kibanamachine]

Backport

This will backport the following commits from main to 8.x:

• [ML][Rules] Fixes deletion in Check interval input for anomaly detection rule (#193420)

Questions ?

Please refer to the Backport tool documentation

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: fe61295

Failed CI Steps

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
ml	4.6MB	4.6MB	+40.0B

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

cc @rbrtj