suppress rviz logging to warnings and above (ros-navigation#5163)

* suppress rviz to warnings and above

Signed-off-by: Steve Macenski <stevenmacenski@gmail.com>

* Update nav2_bringup/launch/rviz_launch.py

Signed-off-by: Steve Macenski <stevenmacenski@gmail.com>

---------

Signed-off-by: Steve Macenski <stevenmacenski@gmail.com>

Author: SteveMacenski

nav2_bringup/launch/rviz_launch.py

@@ -58,7 +58,7 @@ def generate_launch_description() -> LaunchDescription:
         package='rviz2',
         executable='rviz2',
         namespace=namespace,
-        arguments=['-d', rviz_config_file],
+        arguments=['-d', rviz_config_file, '--ros-args', '--log-level', 'warn'],
         output='screen',
         parameters=[{'use_sim_time': use_sim_time}],
         remappings=[