added diagnostics remapping and namespace to system_status

[delihus]

husarion@panther-1502-rpi:~$ ros2 topic list
/panther/battery
/panther/battery_1_raw
/panther/cmd_vel
/panther/diagnostics
/panther/driver/motor_controllers_state
/panther/dynamic_joint_states
/panther/ekf_node/set_pose
/panther/hardware/e_stop
/panther/hardware/io_state
/panther/imu/data
/panther/imu_broadcaster/imu
/panther/imu_broadcaster/transition_event
/panther/joint_state_broadcaster/transition_event
/panther/joint_states
/panther/lights/driver/channel_1_frame
/panther/lights/driver/channel_2_frame
/panther/odom/wheels
/panther/odometry/filtered
/panther/panther_base_controller/transition_event
/panther/robot_description
/panther/system_status
/parameter_events
/rosout
/tf
/tf_static

Added namespaces to all diagnostics topics.