cs: add missing type

Author: soyuka

src/Metadata/Resource/Factory/NotExposedOperationResourceMetadataCollectionFactory.php

@@ -60,6 +60,7 @@ public function create(string $resourceClass): ResourceMetadataCollection
         foreach ($resourceMetadataCollection as $resource) {
             $operations = $resource->getOperations();
 
+            /** @var ApiPlatform\Metadata\HttpOperation $operation */
             foreach ($operations as $operation) {
                 // An item operation has been found, nothing to do anymore in this factory
                 if (('GET' === $operation->getMethod() && !$operation instanceof CollectionOperationInterface) || ($operation->getExtraProperties()['is_legacy_resource_metadata'] ?? false)) {