Upgrade OPA Gatekeeper

Summary

• Update OPA Gatekeeper tag to latest 3.3.0-bb.0
• Modified the new way opa-gatekeeper chart handles image pullSecrets.

This is for Epic: https://repo1.dso.mil/groups/platform-one/big-bang/-/epics/63

Closes: https://repo1.dso.mil/platform-one/big-bang/bigbang/-/issues/342

chart/templates/gatekeeper/gatekeeper-helmrelease.yaml

@@ -50,6 +50,7 @@ spec:
   values:
     disableValidatingWebhook: true
     createNamespace: false
-    imagePullSecrets:
-    - name: private-registry
-{{- end }}
\ No newline at end of file
+    image:
+      pullSecrets:
+      - name: private-registry
+{{- end }}