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/HouseholdMemberController.php

@@ -44,6 +44,7 @@ class HouseholdMemberController extends ApiController
         private readonly HouseholdRepository $householdRepository,
         private readonly Security $security,
         private readonly PositionRepository $positionRepository,
+        private readonly \Doctrine\Persistence\ManagerRegistry $managerRegistry,
     ) {}
 
     /**
@@ -62,7 +63,7 @@ class HouseholdMemberController extends ApiController
         $form->handleRequest($request);
 
         if ($form->isSubmitted() && $form->isValid()) {
-            $this->getDoctrine()->getManager()->flush();
+            $this->managerRegistry->getManager()->flush();
 
             $this->addFlash('success', $this->translator
                 ->trans('household.successfully saved member'));
@@ -204,7 +205,7 @@ class HouseholdMemberController extends ApiController
         // launch events on post move
         $editor->postMove();
 
-        $em = $this->getDoctrine()->getManager();
+        $em = $this->managerRegistry->getManager();
 
         // if new household, persist it
         if (