Revert "AC-15054: Product Add to Cart issue in Rest API"

This reverts commit 2f851aa.

Author: sumesh-GL

app/code/Magento/Quote/Test/Unit/Plugin/Webapi/ValidateProductWebsiteAssignmentTest.php

@@ -245,6 +245,7 @@ public function testBeforeSaveProductWebsiteIdsNotArray()
         $quoteId = 1;
         $storeId = 1;
         $productId = 123;
+        $websiteId = 1;
         $productWebsiteIds = null; // Not an array
 
         $this->cartItemMock->expects($this->once())
@@ -398,6 +399,8 @@ public function testBeforeSaveEmptyWebsiteIds()
         $quoteId = 1;
         $storeId = 1;
         $productId = 123;
+        $websiteId = 1;
+        $productWebsiteIds = []; // Empty array
 
         $this->cartItemMock->expects($this->once())
             ->method('getSku')