Issue #3445714 - Move files

Closes #3445714

src/Controller/UnusedModulesController.php

 <?php
 
-namespace Drupal\unused_modules;
+namespace Drupal\unused_modules\Controller;
 
 use Drupal\Core\Controller\ControllerBase;
+use Drupal\unused_modules\UnusedModulesHelperService;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**