Improve test for sharing assets

We should have test cases with more complex assets:

• 3D imported Components with property aliases https://bugreports.qt.io/browse/QDS-13751
  • Export/import into new project as .qdsbundle
  • Add to/from Content Library
  • Check the visual outcome (3D View image verification)
  • Check possible errors, e.g. in Navigator
  • Check property view for exposed custom properties
• 3D imported Components with 3D child components https://bugreports.qt.io/browse/QDS-13746
  • Export/import into new project as .qdsbundle 
  • Add to/from Content Library / User Assets
  • Check the visual outcome (3D View image verification)
  • Check possible errors, e.g. in Navigator
• 3D imported component using Material bundle material
  • Apply bundle material to component of 3D model
  • Export/import into new project as .qdsbundle
  • Check the visual outcome (3D View image verification)
  • Check possible errors, e.g. in Navigator
• 3D local component/Node that uses a component from same folder or a sub folder.