feat: re-enable `require-image-signature` policy

chart/templates/kyverno-policies/values.yaml

@@ -233,7 +233,7 @@ policies:
 
   # Kyverno Beta feature - https://kyverno.io/docs/writing-policies/verify-images/
   require-image-signature:
-    enabled: false
+    enabled: true
     validationFailureAction: audit
 
   require-istio-on-namespaces:

tests/test-values.yaml

@@ -423,8 +423,6 @@ kyvernoPolicies:
           - 'kyverno-policies-bbtest/test: required'
           - kyverno-policies-bbtest/required
       require-image-signature:
-        enabled: true
-        validationFailureAction: enforce
         parameters:
           require:
           - imageReferences: