fix: image for gatekeeper is set in the chart and should not be hardcoded in the HelmRelease

Summary

closes #102 (closed)

Sorta. It doesn't stop the conversation about the best way to provide configurations to Umbrella/charts, but should unblock @cassiesousa from updating the registries.

Relevant logs/screenshots

(Include any relevant logs/screenshots)

chart/templates/gatekeeper/gatekeeper-helmrelease.yaml

@@ -42,9 +42,6 @@ spec:
       valuesKey: "gatekeeper.yaml"
 
   values:
-    image:
-      repository: registry1.dso.mil/ironbank/opensource/openpolicyagent/gatekeeper
-      release: v3.1.2
     disableValidatingWebhook: true
     createNamespace: false
     imagePullSecrets: