MTA-3864: Create auto test to check Cancel checkout

Author: rliukshyn

dev/tests/functional/tests/app/Magento/Ui/Test/Block/Adminhtml/DataGrid.php

@@ -389,13 +389,16 @@ public function sortGridByField($field, $sort = "desc")
     }
 
     /**
+     * Sort grid by column.
+     *
      * @param string $columnLabel
      */
     public function sortByColumn($columnLabel)
     {
         $this->waitLoader();
         $this->getTemplateBlock()->waitForElementNotVisible($this->loader);
         $this->_rootElement->find(sprintf($this->columnHeader, $columnLabel), Locator::SELECTOR_XPATH)->click();
+        $this->waitLoader();
     }
 
     /**