`roc connect` does not disconnect when instance quits

[Nuru]

If you use roc connect to connect to an instance, it hangs when the instance quits at the end of the job. Ideally it should exit, but at least there should be a way to terminate it (e.g. ctrl-C, ~.). Right now I cannot terminate it from the terminal, I have to go to another terminal window, find the session-manager-plugin process, and kill -HUP it.

Furthermore, after killing the session manager, the terminal is in a bad state, and I need to restore it with stty sane.

[crohr]

@Nuru not sure yet how to address this, because we want to pass all signals to the SSM client as well. It does auto-exit after a while, maybe there is a way to reduce the time it takes to detect the disconnect.