Fix the test failure of wrong messages count

Generate rclcpp::Node before start_recording since rclcpp::Node will set
parameters of use_sim_time and publish message to parameter_events.
This will cause the wrong messages count in the test.

Signed-off-by: evshary <evshary@gmail.com>

rosbag2_transport/test/rosbag2_transport/test_record_all_no_discovery.cpp

@@ -27,10 +27,11 @@ TEST_F(RecordIntegrationTestFixture, record_all_without_discovery_ignores_later_
   auto string_message = get_messages_strings()[0];
   string_message->string_value = "Hello World";
 
+  auto publisher_node = std::make_shared<rclcpp::Node>("publisher_for_test");
+
   start_recording({true, true, {}, "rmw_format", 1ms});
 
   std::this_thread::sleep_for(100ms);
-  auto publisher_node = std::make_shared<rclcpp::Node>("publisher_for_test");
   auto publisher = publisher_node->create_publisher<test_msgs::msg::Strings>("/string_topic", 10);
   for (int i = 0; i < 5; ++i) {
     std::this_thread::sleep_for(20ms);