After successfully building gatekeeper v3.11.1, we need to update the policy-collections

Here is an example of a policy-collection policy but there are open questions below:

https://github.com/open-cluster-management-io/policy-collection/blob/main/community/CM-Configuration-Management/policy-gatekeeper-sample.yaml#L93-L103

What to discuss:

1. What is the purpose of this? Why we need this?
2. Should we set emitAdmissionEvents to false(default) 

opinion 1: This seems misleading because the namespace creation was successfully rejected.