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Validation for CRD custom resources: feature gate promotion alpha->beta

**What this PR does / why we need it**: This promotes CRD Validation from **alpha** to **beta**.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #53829

**Special notes for your reviewer**: Issue #53829 discusses potential blockers to promoting CRD Validation to beta. None of the potential blockers are actual blockers, as they can all be accomplished without backward incompatible changes.

**Release note**:

```release-note
Promote validation for custom resources defined through CRD to beta
```

cc: @sttts @nikhita @mbohlool