Recreate the opt-in/opt-out logic for deepcopy

This is the last piece of Clayton's #26179 to be implemented with file tags.
All diffs are accounted for.  Followup will use this to streamline some
packages.

Also add some V(5) debugging - it was helpful in diagnosing various issues, it
may be helpful again.

pkg/apis/rbac/v1alpha1/doc.go

@@ -15,7 +15,7 @@ limitations under the License.
 */
 
 // +groupName=rbac.authorization.k8s.io
-// +k8s:deepcopy-gen=register
+// +k8s:deepcopy-gen=package,register
 
 // +genconversion=true
 package v1alpha1