B2B-1655: Add MFTF test for MC-38949

 - Removing copyFile helper function

Author: dhaecker

app/code/Magento/Catalog/Test/Mftf/Helper/LocalFileAssertions.php

@@ -116,22 +116,6 @@ public function createDirectory($path, $permissions = 0777): void
         $this->driver->createDirectory($sourceRealPath, $permissions);
     }
 
-    /**
-     * Copy a file
-     *
-     * @param string $source
-     * @param string $destination
-     * @return void
-     *
-     * @throws \Magento\Framework\Exception\FileSystemException
-     */
-    public function copyFile($source, $destination): void
-    {
-        $sourceRealPath = $this->expandPath($source);
-        $destinationRealPath = $this->expandPath($destination);
-        $this->driver->copy($sourceRealPath, $destinationRealPath);
-    }
-
     /**
      * Assert a file exists
      *