Do not block transition in EntityWorkflow when the user is member of a dest user group

- refactor EntityWorkflowGuardTransition + tests
- allow to find easily user within userGroup by adding a dedicated method to UserGroup::contains

src/Bundle/ChillMainBundle/Entity/UserGroup.php

@@ -141,4 +141,9 @@ class UserGroup
     {
         return true;
     }
+
+    public function contains(User $user): bool
+    {
+        return $this->users->contains($user);
+    }
 }

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

@@ -203,7 +203,9 @@ class EntityWorkflowStep
 
     /**
      * get all the users which are allowed to apply a transition: those added manually, and
-     * those added automatically bu using an access key.
+     * those added automatically by using an access key.
+     *
+     * This method exclude the users associated with user groups
      *
      * @psalm-suppress DuplicateArrayKey
      */
@@ -217,6 +219,14 @@ class EntityWorkflowStep
         );
     }
 
+    /**
+     * @return Collection<int, UserGroup>
+     */
+    public function getDestUserGroups(): Collection
+    {
+        return $this->destUserGroups;
+    }
+
     public function getCcUser(): Collection
     {
         return $this->ccUser;