Remove `v1beta1/ingress` from config

In chart/templates/bigbang/gatekeeper-config.yaml, we are syncing extensions/v1beta1/Ingress and networking.k8s.io/v1beta1/Ingress. Since Kubernetes v1.22, these APIs have been removed. Now that v1.21 and older Kubernetes versions are no longer under support, it should be safe for us to remove these.

Currently, we get a log of errors in the GK logs about trying to sync these two APIs. In addition, it looks like the inclusion of these may cause additional load on the API (although it is probably minor).

We still have networking.k8s.io/v1/Ingress, so removing the deprecated APIs should be fine.