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/ChillMainBundle/Controller/UserProfileController.php

@@ -27,6 +27,7 @@ final class UserProfileController extends AbstractController
     public function __construct(
         private readonly TranslatorInterface $translator,
         private readonly ChillSecurity $security,
+        private readonly \Doctrine\Persistence\ManagerRegistry $managerRegistry,
     ) {}
 
     /**
@@ -49,7 +50,7 @@ final class UserProfileController extends AbstractController
 
             $user->setPhonenumber($phonenumber);
 
-            $this->getDoctrine()->getManager()->flush();
+            $this->managerRegistry->getManager()->flush();
             $this->addFlash('success', $this->translator->trans('user.profile.Phonenumber successfully updated!'));
 
             return $this->redirectToRoute('chill_main_user_profile');