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

- Fix media gallery resolver cache invalidation on import when changing label on existing entry

Author: danmooney2

app/code/Magento/CatalogGraphQl/Observer/AfterImportDataObserver.php

@@ -55,8 +55,11 @@ public function __construct(
     public function execute(Observer $observer)
     {
         $mediaGalleryEntriesChanged = $observer->getEvent()->getMediaGallery();
+        $mediaGalleryLabelsChanged = $observer->getEvent()->getMediaGalleryLabels();
 
-        if (empty($mediaGalleryEntriesChanged)) {
+        if (empty($mediaGalleryEntriesChanged) &&
+            empty($mediaGalleryLabelsChanged)
+        ) {
             return;
         }
 
@@ -66,7 +69,11 @@ public function execute(Observer $observer)
             $productSkusToInvalidate[] = array_keys($productSkus);
         }
 
-        $productSkusToInvalidate = array_merge(...$productSkusToInvalidate);
+        foreach ($mediaGalleryLabelsChanged as $label) {
+            $productSkusToInvalidate[] = [$label['imageData']['sku']];
+        }
+
+        $productSkusToInvalidate = array_unique(array_merge(...$productSkusToInvalidate));
         $products = $this->productRepository->getList(
             $this->criteriaBuilder->addFilter('sku', $productSkusToInvalidate, 'in')->create()
         )->getItems();

app/code/Magento/CatalogImportExport/Model/Import/Product.php

@@ -1694,7 +1694,12 @@ protected function _saveProducts()
             $this->_saveProductAttributes($attributes);
             $this->_eventManager->dispatch(
                 'catalog_product_import_bunch_save_after',
-                ['adapter' => $this, 'bunch' => $bunch, 'media_gallery' => $mediaGallery]
+                [
+                    'adapter' => $this,
+                    'bunch' => $bunch,
+                    'media_gallery' => $mediaGallery,
+                    'media_gallery_labels' => $labelsForUpdate,
+                ]
             );
         }
         return $this;