Merge pull request #55812 from deads2k/admission-17-external

Automatic merge from submit-queue (batch tested with PRs 55812, 55752, 55447, 55848, 50984). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Make versioned types for webhook admission config

Versioned webhook admission config type as promised in kubernetes/kubernetes#54414.

@kubernetes/sig-api-machinery-pr-reviews
@ericchiang as promised.  fyi.

```yaml
kind: AdmissionConfiguration
apiVersion: apiserver.k8s.io/v1alpha1
plugins:
- name: GenericAdmissionWebhook
  configuration:
    kind: WebhookAdmission
    apiVersion: apiserver.config.k8s.io/v1alpha1
    kubeConfigFile: /path/to/my/file
```

`ADMISSION_CONTROL_CONFIG_FILE=../foo.yaml hack/local-up-cluster.sh`

Kubernetes-commit: 25ebf875b4235cb8f43be2aec699d62e78339cec