--mutation-annotations mutation-id is not correct

[yiraeChristineKim]

What steps did you take and what happened:
Add --mutation-annotations
and check the mutated resource's annotation
the "gatekeeper.sh/mutation-id" is not matching with actual mutation(Assign, AssignImage)

What did you expect to happen:
Should be match with the mutation resource uid

• Gatekeeper version: latest 3.17
• Kubernetes version: Client Version: v1.31.3
  Kustomize Version: v5.4.2
  Server Version: v1.30.6

[JaydipGabani]

As far as I can tell, this has always been the case - #1545.

func (s *System) mutate(obj *unstructured.Unstructured, ns *corev1.Namespace) (int, error) {
	mutationUUID := s.newUUID()
	original := obj.DeepCopy()

I am not familiar with the intention behind this. @maxsmythe @ritazh @sozercan Feel free to share details if you recall.