feat(openshift-image-registry): Remove useless samples

This patch intstructs the samples operator to remove all samples from
the cluster and not polute the registry or interface with them. As a
positive side effect, the complaining about missing redhat pull secrets
stop.

clusters/okd4/openshift-image-registry/kustomization.yaml

@@ -4,3 +4,4 @@ resources:
 - s3-credentials.yaml
 - operator-config.yaml
 - default-registry-config.yaml
+- samples-config.yaml

clusters/okd4/openshift-image-registry/samples-config.yaml

+apiVersion: samples.operator.openshift.io/v1
+kind: Config
+metadata:
+  name: cluster
+  annotations:
+    kustomize.toolkit.fluxcd.io/prune: disabled
+spec:
+  architectures:
+  - x86_64
+  managementState: Removed