B2B-2677: [MediaGallery]Implement data caching for GraphQL results on resolver level

- Use SKU instead of ID for tags

Author: danmooney2

app/code/Magento/CatalogGraphQl/Model/Resolver/Cache/Product/MediaGallery/ResolverCacheIdentity.php

@@ -32,7 +32,7 @@ public function getIdentities($resolvedData, ?array $parentResolvedData = null):
         $mediaGalleryEntryProduct = array_pop($resolvedData)['model'];
         return [
             self::CACHE_TAG,
-            sprintf('%s_%s', self::CACHE_TAG, $mediaGalleryEntryProduct->getId())
+            sprintf('%s_%s', self::CACHE_TAG, $mediaGalleryEntryProduct->getSku())
         ];
     }
 }

dev/tests/api-functional/testsuite/Magento/GraphQl/Catalog/ResolverCache/MediaGalleryTest.php

@@ -465,7 +465,7 @@ private function getExpectedCacheTags(ProductInterface $product): array
 
         return [
             $cacheIdPrefix . strtoupper(ResolverCacheIdentity::CACHE_TAG),
-            $cacheIdPrefix . strtoupper(ResolverCacheIdentity::CACHE_TAG) . '_' . $product->getId(),
+            $cacheIdPrefix . strtoupper(ResolverCacheIdentity::CACHE_TAG . '_' . $product->getSku()),
             $cacheIdPrefix . strtoupper(GraphQlResolverCache::CACHE_TAG),
             $cacheIdPrefix . 'MAGE',
         ];