Fix Positron stdout redirection after Ipykernel closes #1687
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IPykernel will create a thread that redirects all output from fileno of the current sys.stdout and sys.stderr to its IO channels. This is not correctly cleaned up when IPykernel closes. See https://github.com/ipython/ipykernel/blob/2ca799276f4458d50085bb1ef8e2ddeb08a283a6/ipykernel/iostream.py#L439-L444
To fix that, we set the IO streams to /dev/null before launching the kernel.
Adresses posit-dev/positron#5057