fix: Remove the hardcoded image repository from values.yaml (#445)

commons-operator was the only operator setting image.repository in its own
values.yaml. The other 13 non-CSI operators leave it to the registry overlay in
deploy/helm/commons-operator/values/, which publish-helm-chart merges on top at
package time.

The value was also wrong in shape. operator.image renders
"{repository}/{Chart.Name}:{tag}", so repository is the namespace and the chart
name is appended. The hardcoded value already contained the name, so had it ever
taken effect it would have produced .../sdp/commons-operator/commons-operator.

No behaviour change for published charts: the overlay wins the merge either way.

Author: lfrancke

deploy/helm/commons-operator/values.yaml

@@ -1,7 +1,6 @@
 # Default values for commons-operator.
 ---
 image:
-  repository: oci.stackable.tech/sdp/commons-operator
   pullPolicy: IfNotPresent
   pullSecrets: []