gh-143993: Document ways to disable remote debugging support

[RafaelWO]

Although PEP 768 mentions how to disable the mechanism of remote debugging, it is not documented in the Python docs.

This change adds a note on how to disable remote debugging support in a Python interpreter to the remote debugging how-to and to the sys.remote_exec docs.

• Issue: Document how to disable remote debugging #143993

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📚 Documentation preview 📚:

• https://cpython-previews--143994.org.readthedocs.build/en/143994/howto/remote_debugging.html#remote-debugging
• https://cpython-previews--143994.org.readthedocs.build/en/143994/library/sys.html#sys.remote_exec

[hugovk]

Thanks for the PR! It's a good idea to document these three methods together.

@pablogsal What do you think about the placement and prominence of these?

• https://cpython-previews--143994.org.readthedocs.build/en/143994/howto/remote_debugging.html#remote-debugging
• https://cpython-previews--143994.org.readthedocs.build/en/143994/library/sys.html#sys.remote_exec

Maybe they don't need to be highlighted in a note admonition and could be regular text?

In the HOWTO, it could perhaps to its own section with a header, which will make it easier to share.

In the sys page, perhaps it could also be regular text at the end of function description (just before "Availability: Unix, Windows").

[pablogsal]

This probably deserves its own little section that appears in the sidebar :)

[vstinner]

I would prefer suggesting a specific value such as 1.