* daemon: tighten systemd duplicate gateway detection (#15849)
* fix three issues from PR review
* fix windows unit tests due to posix/windows path differences
* ensure line continuations are handled in systemd units
* fix misleading test name
* attempt fix windows test due to fs path separator
* fix system_dir separator, fix platform side-effect
* change approach for mocking systemd filesystem test
* normalize systemd paths to linux style
* revert to vers that didnt impact win32 tests
* back out all systemd inspect tests
* change test approach to avoid other tests issues
* fix: tighten systemd duplicate gateway detection (#45328) (thanks @gregretkowski)
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Co-authored-by: Ayaan Zaidi <hi@obviy.us>
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