Handle: NetworkError: Failed to execute 'open' on 'SerialPort': Failed to open serial port while rooting

[j005u]

We don't currently handle the "NetworkError: Failed to execute 'open' on 'SerialPort': Failed to open serial port while rooting" exception while rooting.

This happens when something else is keeping the COM port busy on Windows such as Cura, Prusa Slicer or DJI Assistant.

We should catch the exception and tell the user: "Unable to open serial port. This is usually caused by some other application such as DJI Assistant, Cura or Prusa Slicer keeping it busy. Please close any such applications and try again."

It's also possible that we handle it, but only after 10 retries. I think this error is usually unlikely to go away and in this specific case we can skip retrying?