Merge #16973: test: Fix combine_logs.py for AppVeyor build

d478a472eb0d666e8a762ed8d24fafbabc5f94f3 test: Fix combine_logs.py for AppVeyor build (Martin Zumsande)

Pull request description:

  Fixes #16894

  This fixes the problem of AppVeyor builds not showing `debug.log` if a functional test fails, because the windows separator `\` doesn't work together with the regex in `combine_logs.py`.

  A fix was already attempted in  #16896, however, that PR became inactive and was marked "up for grabs", plus it's a really small change.

  As suggested by jamesob, this PR uses `pathlib`: For the glob and to convert the path to a posix-style string, it leaves the regex as is (in contrast to #16896 which adjusted the regex).

  I tested this locally on Windows and Ubuntu.

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