Fix running Python commands that include paths with spaces (#21981)

This PR fixes running Python commands that include paths with spaces by
wrapping python commands and their arguments in quotation marks.

I fixed this only in Python as I noticed this while trying to run
`pytest` in Zed.

Probably this is not the best approach as it doesn't fix other languages
too, though I don't know enough about the codebase to fix it like that.
I'm not even sure if it's actually feasible right now.

I didn't add tests for this either as I couldn't really understand how
to easily to that, I tried to look at other languages but couldn't find
one that tests their `ContextProvider` directly.

Release Notes:

- Fix running Python commands that include paths with spaces

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Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>