Model used as base for instancing is hidden when instanced models are drawn, but is still selectable in editor

When e.g. QtQuick3D.InstanceList is specified for instancing property of a model, and the instanced models are drawn on editors, the base model is hidden. However, it is still selectable in the 3D editor. It shouldn't be selectable in this case.

Note that picking in 3D editor is currently undergoing a change, so this needs to be double checked if it works properly with changes introduced by QDS-4978. If not, it may require changes on QtQuick3D side to detect that model is hidden because of instancing.