Just like vscode-js-debug, debugpy uses the `name` key in
StartDebuggingRequestArguments for this:


https://github.com/microsoft/debugpy/blob/0d65353cc6e519292296bf567bdc6dfa5bcd4ffc/src/debugpy/adapter/clients.py#L753

Release Notes:

- debugger: Made the names of Python subprocesses in the session list
more helpful.