revert(gatekeeper): namespace labeling

chart/templates/gatekeeper/namespace.yaml

@@ -3,6 +3,7 @@ apiVersion: v1
 kind: Namespace
 metadata:
   labels:
+    admission.gatekeeper.sh/ignore: no-self-managing
     control-plane: controller-manager
     gatekeeper.sh/system: "yes"
     app.kubernetes.io/name: gatekeeper

chart/templates/gatekeeper/values.yaml

@@ -9,6 +9,7 @@ image:
   - name: private-registry
 postInstall:
   labelNamespace:
+    enabled: false
     image:
       pullSecrets:
       - name: private-registry