feat: re-add parameter-less getEffectiveNamespaces method

Author: metacosm

Diff for: operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/ControllerConfiguration.java

@@ -4,6 +4,7 @@
 import java.util.Collections;
 import java.util.List;
 import java.util.Optional;
+import java.util.Set;
 
 import io.fabric8.kubernetes.api.model.HasMetadata;
 import io.javaoperatorsdk.operator.ReconcilerUtils;
@@ -118,4 +119,9 @@ default Class<P> getResourceClass() {
     return (Class<P>) Utils.getFirstTypeArgumentFromSuperClassOrInterface(getClass(),
         ControllerConfiguration.class);
   }
+
+  @SuppressWarnings("unused")
+  default Set<String> getEffectiveNamespaces() {
+    return ResourceConfiguration.super.getEffectiveNamespaces(getConfigurationService());
+  }
 }