Fixed: [workflow] validation of users in cc and dest

The validation is processed at the form step, so before the transition is processed

src/Bundle/ChillMainBundle/Form/WorkflowStepType.php

@@ -243,6 +243,20 @@ class WorkflowStepType extends AbstractType
                         }
                     }
                 ),
+                new Callback(
+                    function ($step, ExecutionContextInterface $context, $payload) {
+                        $form = $context->getObject();
+
+                        foreach($form->get('future_dest_users')->getData() as $u) {
+                            if (in_array($u, $form->get('future_cc_users')->getData(), true)) {
+                                $context
+                                    ->buildViolation('workflow.The user in cc cannot be a dest user in the same workflow step')
+                                    ->atPath('ccUsers')
+                                    ->addViolation();
+                            }
+                        }
+                    }
+                )
             ]);
     }
 }