S2a: purge legacy Form Builder PHP code and routes

api/app/Http/Controllers/Api/V1/PersonController.php

@@ -19,7 +19,6 @@ use App\Models\Person;
 use App\Models\User;
 use App\Services\EmailService;
 use App\Services\PersonIdentityService;
-use App\Services\TagSyncService;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Gate;
@@ -34,7 +33,6 @@ final class PersonController extends Controller
 
     public function __construct(
         private readonly PersonIdentityService $identityService,
-        private readonly TagSyncService $tagSyncService,
         private readonly EmailService $emailService,
     ) {}
 
@@ -188,8 +186,6 @@ final class PersonController extends Controller
             $person->save();
         }
 
-        $this->tagSyncService->syncFromRegistration($person);
-
         if ($person->email) {
             $portalUrl = config('app.frontend_portal_url');