#39111: Product Collection - addMediaGalleryData calls getSize when the collection maybe or will be loaded (Can use count to avoid an extra DB query)

- Fixed call count instead of getSize if collection is loaded.

Author: Ihor Kh

app/code/Magento/Catalog/Test/Unit/Model/ResourceModel/Product/CollectionTest.php

@@ -1,7 +1,7 @@
 <?php
 /**
- * Copyright © Magento, Inc. All rights reserved.
- * See COPYING.txt for license details.
+ * Copyright 2025 Adobe
+ * All Rights Reserved.
  */
 declare(strict_types=1);