MCP-584: Disable inventory check on quote load

- Return customied config option;
- Remove set quantity to quote item;

Author: adifucan

app/code/Magento/Quote/Model/Config.php

@@ -35,7 +35,6 @@ public function __construct(ScopeConfigInterface $config)
      */
     public function isEnabled(): bool
     {
-        #return (bool)$this->config->getValue(self::XML_PATH_INVENTORY_CHECK_ENABLED);
-        return false;
+        return (bool)$this->config->getValue(self::XML_PATH_INVENTORY_CHECK_ENABLED);
     }
 }

app/code/Magento/Quote/Model/ResourceModel/Quote/Item/Collection.php

@@ -293,8 +293,6 @@ protected function _assignProducts(): self
                 $item->setQtyOptions($qtyOptions)->setProduct($product);
                 if ($this->config->isEnabled()) {
                     $item->checkData();
-                } else {
-                    $item->setQty((int)$item->getQty());
                 }
 
             }