Merge topic 'ci-qt6'

32cb354a Examples/QML: use `VTK_QT_VERSION`
1c0d4c11 Examples/QML: quote generator expressions
546d4c9a Examples/QML: fix CMake command style
6b3e195a Examples/QML: fix indentation
0ae11c6c GUISupportQtQuick: convert testing CMake file to Unix line endings
5d31e13f GUISupportQtQuick: download data required by the tests
c1335dee ci: exclude failing tests under Qt6
6cd5da29 ci: migrate all Qt builds to Qt6
...

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Acked-by: Sankhesh Jhaveri <sankhesh.jhaveri@kitware.com>
Merge-request: !10089