Feature: [workflow] do not send a notification for each step to creator's workflow

Now, by default:

- the creator will receive a notification for the last step only;
- the participant / assignee for each step won't receive a notification (unless they explicitly choose to receive one)

src/Bundle/ChillMainBundle/Controller/WorkflowController.php

@@ -85,7 +85,6 @@ class WorkflowController extends AbstractController
             ->setRelatedEntityClass($request->query->get('entityClass'))
             ->setRelatedEntityId($request->query->getInt('entityId'))
             ->setWorkflowName($request->query->get('workflow'))
-            ->addSubscriberToStep($this->getUser())
             ->addSubscriberToFinal($this->getUser());
 
         $errors = $this->validator->validate($entityWorkflow, null, ['creation']);

src/Bundle/ChillMainBundle/Entity/Workflow/EntityWorkflowStep.php

@@ -132,8 +132,6 @@ class EntityWorkflowStep
     {
         if (!$this->destUser->contains($user)) {
             $this->destUser[] = $user;
-            $this->getEntityWorkflow()
-                ->addSubscriberToFinal($user);
         }
 
         return $this;
@@ -143,8 +141,6 @@ class EntityWorkflowStep
     {
         if (!$this->destUserByAccessKey->contains($user) && !$this->destUser->contains($user)) {
             $this->destUserByAccessKey[] = $user;
-            $this->getEntityWorkflow()
-                ->addSubscriberToFinal($user);
         }
 
         return $this;