Improve logging on plebian startup in case of a crash

[volllly]

If the Plebian crashes before its able to send logs to the Monarch the logs will be lost at the moment.

We should update the Monarch to capture and print stdout and stderr of the plebian if it crashes before giving the startup signal

[volllly]

To reproduce you can start the launcher twice. The second instance of the launcher should experience the behavior shown in #96.

The desired behavior would be that we see logs from these plebeian instances. These logs are lost in this case because they cannot be sent to the launcher via the grpc ProcessHostService because the second launcher instance cannot start the service (because it uses the same launcher port as the first instance).
In the case that this happens we want to capture the stdout of the plebians and print that.