feat: replace overly complex and unnecessary form choice loader for rooms

config/services.yaml

@@ -64,10 +64,6 @@ services:
             $cache: '@cache.app'
             $logger: '@monolog.logger.bpn'
 
-    App\Form\Service\Factory\ParticipantRoomChoiceLoaderFactory:
-        arguments:
-            $choiceListFactory: '@form.choice_list_factory.default'
-
     # Field Handlers with dependencies
     App\Form\Service\ParticipantInsuranceFieldHandler: ~
     App\Form\Service\ParticipantBulkInsuranceFieldHandler: ~