Merge pull request #53611 from p0lyn0mial/pass_scheme_to_admission_plugins

Automatic merge from submit-queue. 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>.

removes k8s.io/kubernetes/pkg/api dependency from the webhook plugin.

**What this PR does / why we need it**: removes `k8s.io/kubernetes/pkg/api` dependency from `webhook` plugin. The runtime.scheme can be injected to the webhook from the plugin initializer.

**Release note**:

```
NONE
```

cmd/kube-apiserver/app/server.go

@@ -484,6 +484,7 @@ func BuildGenericConfig(s *options.ServerRunOptions, proxyTransport *http.Transp
 		certBytes,
 		keyBytes,
 		kubeClientConfig,
+		api.Scheme,
 		pluginInitializer)
 	if err != nil {
 		return nil, nil, nil, nil, nil, fmt.Errorf("failed to initialize admission: %v", err)