[JTC] Remove unused test code (#1095)

(cherry picked from commit 9e97c00)

joint_trajectory_controller/test/test_trajectory_controller.cpp

@@ -51,17 +51,13 @@ using lifecycle_msgs::msg::State;
 using test_trajectory_controllers::TrajectoryControllerTest;
 using test_trajectory_controllers::TrajectoryControllerTestParameterized;
 
-void spin(rclcpp::executors::MultiThreadedExecutor * exe) { exe->spin(); }
-
 TEST_P(TrajectoryControllerTestParameterized, configure_state_ignores_commands)
 {
   rclcpp::executors::MultiThreadedExecutor executor;
   SetUpTrajectoryController(executor);
   traj_controller_->get_node()->set_parameter(
     rclcpp::Parameter("allow_nonzero_velocity_at_trajectory_end", true));
 
-  // const auto future_handle_ = std::async(std::launch::async, spin, &executor);
-
   const auto state = traj_controller_->get_node()->configure();
   ASSERT_EQ(state.id(), State::PRIMARY_STATE_INACTIVE);