fix: updated the option for evaluation mode (#2482)

Author: Daisyprakash

modules/gke-standard-cluster/metadata.display.yaml

@@ -100,8 +100,8 @@ spec:
  enumValueLabels:
  - label: DISABLED
  value: DISABLED
- - label: POLICY_BINDINGS
- value: POLICY_BINDINGS
+ - label: PROJECT_SINGLETON_POLICY_ENFORCE
+ value: PROJECT_SINGLETON_POLICY_ENFORCE
  cluster_autoscaling:
  name: cluster_autoscaling
  title: Cluster Autoscaling