[7.x] [ML] Transforms: Adds retention policy options to transform UI. (#91162)

[walterra]

Backports the following commits to 7.x:

• [ML] Transforms: Adds retention policy options to transform UI. ([ML] Transforms: Adds retention policy options to transform UI. #91162)

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 740fd3c

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
transform	213	214	+1

Async chunks

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

id	before	after	diff
transform	915.8KB	925.7KB	+9.9KB

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