Merge pull request #59793 from nikhita/staging-repos-boilerplate

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>.

staging: add boilerplate header

Follow up of https://github.com/kubernetes/kubernetes/pull/57656.

Adds boilerplate in the relevant staging repos so that they don't need to depend on code-generator's boilerplate.

**Release note**:

```release-note
NONE
```

/cc sttts fisherxu

Kubernetes-commit: 1a1643bb5df07d94330e1b16d182cee660533f91

vendor/k8s.io/api/policy/v1beta1/register.go

@@ -46,6 +46,8 @@ func addKnownTypes(scheme *runtime.Scheme) error {
 	scheme.AddKnownTypes(SchemeGroupVersion,
 		&PodDisruptionBudget{},
 		&PodDisruptionBudgetList{},
+		&PodSecurityPolicy{},
+		&PodSecurityPolicyList{},
 		&Eviction{},
 	)
 	// Add the watch version that applies