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Fix subresource discovery and versioning

Fixes https://github.com/kubernetes/kubernetes/issues/54684
Related to https://github.com/kubernetes/kubernetes/pull/54586

Allows distinct subresource group/version/kind to be used for each version (gives us a path to move to autoscaling/v1 for apps, or policy/v1 for eviction, etc)

Added tests to ensure scale subresources have expected discovery info, and that the object returned matches discovery, and that the endpoint accepts the advertised version

```release-note
Fixes discovery information for scale subresources in the apps API group
```