Move the logic to check if dest users are required to a dedicated constraint

- Create a dedicated constraint to check if the destUsers are required by the applied transition.
- Apply on WorkflowTransitionContextDTO and, if required, use the built-in constraints
- create tests

src/Bundle/ChillMainBundle/Workflow/WorkflowTransitionContextDTO.php

@@ -15,6 +15,7 @@ use Chill\MainBundle\Entity\User;
 use Chill\MainBundle\Entity\UserGroup;
 use Chill\MainBundle\Entity\Workflow\EntityWorkflow;
 use Chill\MainBundle\Workflow\Validator\TransitionHasDestineeIfIsSentExternal;
+use Chill\MainBundle\Workflow\Validator\TransitionHasDestUserIfRequired;
 use Chill\PersonBundle\Entity\Person;
 use Chill\ThirdPartyBundle\Entity\ThirdParty;
 use Chill\ThirdPartyBundle\Validator\ThirdPartyHasEmail;
@@ -26,6 +27,7 @@ use Symfony\Component\Workflow\Transition;
  * Context for a transition on an workflow entity.
  */
 #[TransitionHasDestineeIfIsSentExternal]
+#[TransitionHasDestUserIfRequired]
 class WorkflowTransitionContextDTO
 {
     /**
@@ -81,6 +83,7 @@ class WorkflowTransitionContextDTO
     ])]
     public array $futureDestineeEmails = [];
 
+    #[Assert\NotNull]
     public ?Transition $transition = null;
 
     public string $comment = '';