future cleanup after RKE2 upgrade > 1.28.8: remove rke2-clear-cisnetworkpolicy-finalizer Kyverno policy

!2549 (merged) was implemented as a workaround to solve #1421 (closed), but once RKE2 will be upgraded to 1.28.9 or higher, we won't need this workaround anymore, and reverting !2549 (merged) will be desirable as a cleanup.