Add "UnusedFormalParameter" suppress warning

Author: VladimirZaets

app/code/Magento/CatalogGraphQl/Model/Resolver/Products/DataProvider/Product/CollectionProcessor/ExtensibleEntityProcessor.php

@@ -37,6 +37,7 @@ public function __construct(JoinProcessorInterface $joinProcessor)
      * @param SearchCriteriaInterface $searchCriteria
      * @param array $attributeNames
      * @return Collection
+     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
      */
     public function process(
         Collection $collection,