Merge pull request #39625 from deads2k/rbac-36-beta

Automatic merge from submit-queue (batch tested with PRs 39625, 39842)

Add RBAC v1beta1

Add `rbac.authorization.k8s.io/v1beta1`.  This scrubs `v1alpha1` to remove cruft, then add `v1beta1`.  We'll update other bits of infrastructure to code to `v1beta1` as a separate step.

```release-note
The `attributeRestrictions` field has been removed from the PolicyRule type in the rbac.authorization.k8s.io/v1alpha1 API. The field was not used by the RBAC authorizer.
```

@kubernetes/sig-auth-misc @liggitt @erictune

test/integration/auth/rbac_test.go

@@ -170,7 +170,7 @@ func (s statusCode) String() string {
 var (
 	writeJobsRoleBinding = `
 {
-  "apiVersion": "rbac.authorization.k8s.io/v1alpha1",
+  "apiVersion": "rbac.authorization.k8s.io/v1beta1",
   "kind": "RoleBinding",
   "metadata": {
     "name": "pi"%s