break WJ relaunch check from start capability

implement special custom error message for
Workflow Job relaunch ability corner case

awx/api/views.py

@@ -2953,6 +2953,13 @@ class WorkflowJobRelaunch(WorkflowsEnforcementMixin, GenericAPIView):
     serializer_class = EmptySerializer
     is_job_start = True
 
+    def check_object_permissions(self, request, obj):
+        if request.method == 'POST' and obj:
+            relaunch_perm, messages = request.user.can_access_with_errors(self.model, 'start', obj)
+            if not relaunch_perm:
+                self.permission_denied(request, message=messages['workflow_job_template'])
+        return super(WorkflowJobRelaunch, self).check_object_permissions(request, obj)
+
     def get(self, request, *args, **kwargs):
         return Response({})