Please fix failing unit tests with Windows platform

[Friedrich W. H. Kossebau]

Hi,

since a long time there are lots of failing unit tests across multiple 
repositories. Could the Windows platform maintainers/stakeholders please look 
soonish into either fixing those tests or properly marking them as expected to 
fail, so the resources the KDE CI spends on running the tests every hour, day 
and week make some sense again, as well as having something usable to diff 
results again, to notice any new regressions?

Please see
  https://build.kde.org/job/Frameworks/view/Platform%20-%20WindowsMSVCQt5.15/ 
(best sort by "S" build status to get a list what need

Otherwise I would tend to propose to declare Windows support as unmaintained, 
if there is no change within the next weeks.

Thanks in advance
Friedrich