add comment why the manual forced cleanup was done

Author: ThoSap

operator/src/test/java/it/aboutbits/postgresql/crd/role/RoleReconcilerTest.java

@@ -269,7 +269,7 @@ void createRole_withMissingClusterConnection_setsPending() {
         );
         assertThat(role.getStatus().getLastPhaseTransitionTime()).isNull();
 
-        // Cleanup manually
+        // We have to manually clean up this as the RoleController#cleanup will always fail as the ClusterConnection does not exist
         kubernetesClient.resource(role).delete();
         role.getMetadata().setFinalizers(null);
         role.getMetadata().setResourceVersion(null);