Investigate uninstaller tests on Windows hanging if the path contains spaces

See https://github.com/conda/constructor/pull/449#issuecomment-1369903905 (note it might be hidden). Copying here for reference:

> The win un-installers fail (run forever if not killed by the `p.communicate(timeout)`).... still all files seem to be removed. Reverting back to an env_dir without space makes it finish without timeout

and

> This PR was created and afaik running green before the uninstaller test PR was merged https://github.com/conda/constructor/pull/569
>
> Now with the uninstaller test PR merged, there is the following situation:
> * the windows uninstallers hang consuming lots of action runner minutes without deleting anything
> * Added a timeout to the test command execution which is visible in the test execution log
> * If the spaces are removed on windows, then the installers won't hang.
> * Spaces on windows should (!?) work anyway already due to windows having spaces in path since long... like `C:\Program Files\`...
> * The uninstallers even hang when commenting almost everything out in the uninstall section in main.nsi.tmpl, see tests done here https://github.com/dbast/constructor/pull/3