Fix some obvious issues, QSKIP or blacklist other problems.
This does not fix all the test failures, but allows to enable most of
the test cases, so that we could catch future regressions.
Task-number: QTBUG-87668
Pick-to: 6.3 6.2
Change-Id: I1ed0b476d4ac55c658c572cfa1379fcdc6137ee8
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>