An auto-hidden dock can cause test flakiness by window resizes and
mouse cursor / focus issues when the autohide is toggled.
Disable it on macOS platforms >= 14.
Task-number: QTQAINFRA-7765
Change-Id: Ie488bccd43c203e5bb9a96e731874bab12c2012c
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Ville-Pekka Karhu <ville-pekka.karhu@qt.io>
Reviewed-by: Aku Pietikäinen <aku.pietikainen@qt.io>