Publish Stop Setpoint doesn't exist

The publish_stop_setpoint doesn't exist in the hydrobaticpoint_server. Either we add it, similar to the go_to_geopoint action server, or we remove it. @ignaciotb ?

https://github.com/smarc-project/smarc2/blob/e7375e6748dfa0d55803a148be638d22238abcbe/behaviours/go_to_hydrobaticpoint/go_to_hydrobaticpoint/hydrobaticpoint_server.py#L330