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/apps/doc.go

@@ -14,6 +14,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-// +k8s:deepcopy-gen=register
+// +k8s:deepcopy-gen=package,register
 
 package apps