adding bucket rollback on multi-upload

src/main/java/it/gov/pagopa/atmlayer/service/model/service/impl/ResourceEntityServiceImpl.java

@@ -185,7 +185,7 @@ public Uni<List<String>> createResourceMultiple(List<ResourceEntity> resourceEnt
                     if (!errors.isEmpty()) {
                         return deleteResourcesFromStorage(uploadedFiles, errors);
                     }
-                    return errors;  // This will be empty if no errors occurred
+                    return Uni.createFrom().item(errors);  // This will be empty if no errors occurred
                 });
     }