Refactor code to directly use Doctrine's ManagerRegistry

Replaced most of the invocations of getDoctrine()->getManager() with ManagerRegistry->getManager(), and added ManagerRegistry injection to controllers where needed. This is part of an ongoing effort to improve code clarity, and avoid unnecessary method chaining in various parts of the codebase.

src/Bundle/ChillPersonBundle/Controller/ClosingMotiveController.php

@@ -21,6 +21,9 @@ use Symfony\Component\HttpFoundation\Request;
  */
 class ClosingMotiveController extends CRUDController
 {
+    public function __construct(private readonly \Doctrine\Persistence\ManagerRegistry $managerRegistry)
+    {
+    }
     /**
      * @param string $action
      */
@@ -31,7 +34,7 @@ class ClosingMotiveController extends CRUDController
         if ($request->query->has('parent_id')) {
             $parentId = $request->query->getInt('parent_id');
 
-            $parent = $this->getDoctrine()->getManager()
+            $parent = $this->managerRegistry->getManager()
                 ->getRepository($this->getEntityClass())
                 ->find($parentId);