B2B-2530: Unskip GraphQL cache tests skipped due to DEVOPS-4924

- Fixed new review comments

Author: avattam06

dev/tests/api-functional/testsuite/Magento/GraphQl/PageCache/CacheTagTest.php

@@ -58,7 +58,6 @@ public function testCacheInvalidationForProducts()
 
         $responseAfterUpdate = $this->graphQlQueryWithResponseHeaders($query);
         $this->assertArrayHasKey(CacheIdCalculator::CACHE_ID_HEADER, $responseAfterUpdate['headers']);
-        $cacheId = $responseAfterUpdate['headers'][CacheIdCalculator::CACHE_ID_HEADER];
         // Cache invalidation happens and cache header value is a MISS after product update
         $this->assertCacheMissAndReturnResponse($query, [CacheIdCalculator::CACHE_ID_HEADER => $cacheId]);
     }

dev/tests/api-functional/testsuite/Magento/GraphQl/PageCache/UrlRewrite/UrlResolverCacheTest.php

@@ -134,7 +134,7 @@ public function testCacheIsInvalidatedForUrlResolver()
         $product = $productRepository->get($productSku, false, null, true);
         $product->setUrlKey('p002-new.html')->save();
 
-        // Verify we obtain a cache MISS the first time we search the cache using this X-Magento-Cache-Id
+        // Verify we obtain a cache MISS first time we search the cache using this X-Magento-Cache-Id
         $this->assertCacheMissAndReturnResponse($urlResolverQuery, [CacheIdCalculator::CACHE_ID_HEADER => $cacheId]);
     }