fix(network): TCP Listener task must not die

[kevindeforth]

resolves #1979

follow-up issue for test: #1984

[netrome]

This is a bit noisy to review since we both alter the behavior and break out the incoming connection handler into a separate function. I feel like this PR could be simplified to a ~5 line change focusing on the new behavior by just changing the inner while loop to an infinite loop with a let Ok(...) = ... else {<handle error and continue>}