ENGCOM-3329: Clean Up Magento/ImportExport/Controller/Adminhtml/History/Download #148

 - Merge Pull Request magento-engcom/import-export-improvements#148 from denispapec/import-export-improvements:phpstan-historydownload
 - Merged commits:
   1. b0240f1
   2. 518b4d4

Author: magento-engcom-team

app/code/Magento/ImportExport/Controller/Adminhtml/History/Download.php

@@ -6,15 +6,21 @@
  */
 namespace Magento\ImportExport\Controller\Adminhtml\History;
 
+use Magento\Framework\App\Action\HttpGetActionInterface;
 use Magento\Framework\App\Filesystem\DirectoryList;
 
-class Download extends \Magento\ImportExport\Controller\Adminhtml\History
+class Download extends \Magento\ImportExport\Controller\Adminhtml\History implements HttpGetActionInterface
 {
     /**
      * @var \Magento\Framework\Controller\Result\RawFactory
      */
     protected $resultRawFactory;
 
+    /**
+     * @var \Magento\Framework\App\Response\Http\FileFactory
+     */
+    private $fileFactory;
+
     /**
      * @param \Magento\Backend\App\Action\Context $context
      * @param \Magento\Framework\App\Response\Http\FileFactory $fileFactory