Added missing new methods to noop implementation

event-listener-provider/src/main/java/org/gcube/keycloak/event/NoOpEventPublisherProvider.java

@@ -51,6 +51,18 @@ public class NoOpEventPublisherProvider extends OrchestratorEventPublisherProvid
                 // Nothing to do
                 return null;
             }
+
+            @Override
+            public int getLastSendHTTPResponseCode() {
+                // Nothing to do
+                return 0;
+            }
+
+            @Override
+            public int getLastRetrieveHTTPResponseCode() {
+                // Nothing to do
+                return 0;
+            }
         };
     }