Window size is not expected in Qt3D tst_PickBoundingVolumeJob

There are consistent test fails when trying to integrate a nodejs update:

538397: Update Nodejs on windows to 20.7 | https://codereview.qt-project.org/c/qt/tqtc-qt5/+/538397

Fails happen in a module that does not use nodejs. 

This change activates Coin to build a new provision VM for Windows 7 after 6 month break. In this new provision build, tst_PickBoundingVolumeJob test in Qt3D consistently fails with tests related to window size:

Coin run:

https://ci-files01-hki.ci.qt.io:8081/coin/integration/qt/tqtc-qt5/tasks/1707721221

Qt3D Windows 7 test logs:

FAIL!  : tst_PickBoundingVolumeJob::viewportCameraAreaGather() Compared values are not the same
    Actual   (window->size()) : QSize(600x582)
    Expected (QSize(600, 600)): QSize(600x600)

This might be related to the new OpenNebula affecting display settings similar to ticket QTQAINFRA-5987

Likely solution is to add/modify resolution settings for Windows 7 in Qt 5.15 like in the related ticket.