Investigate uninstaller tests on Windows hanging if the path contains spaces

[jaimergp]

See #449 (comment) (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 #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 Patch 1 dbast/constructor#3

[github-actions]

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