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Add conversion to properly parse query parameter propagationPolicy

**What this PR does / why we need it**:
This delete request query parameter has been broken for a year. I'm not sure if we want to deprecate the non-standard DeleteOptions body on delete request eventually. 

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #43329

**Special notes for your reviewer**:

**Release note**:

```release-note
API server properly parses propagationPolicy as a query parameter sent with a delete request
```

/sig api-machinery