Rollup merge of #138869 - ChrisDenton:command-curdir, r=tgross35

Try not to use verbatim paths in `Command::current_dir`

If possible, we should try not to use verbatim paths in `Command::current_dir`. It might work but it might also break code in the subprocess that assume the current directory isn't verbatim (including Windows APIs). cc ``@ehuss``

Side note: we now have a lot of ad-hoc fixes like this spread about the place. It'd be good to make a proper `WindowsPath` type that handles all this in one place. But that's a bigger job for another PR.

Author: matthiaskrgr