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Support field selectors for CRDs
Signed-off-by: Andy Goldstein <andy.goldstein@gmail.com>



**What this PR does / why we need it**: allow field selectors to be used with custom resources

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #51046, fixes #49424

**Special notes for your reviewer**:

**Release note**:

```release-note
Custom resources served through CustomResourceDefinition now support field selectors for `metadata.name` and `metadata.namespace`.
```