Update package_simple_background.py (shell at identity, tuned lighting)

Update export_simple_packing_scene_usd.py (shell at identity, tuned lighting)

Add generator/verify script teleop_openarm_demo_simready_warehouse_task_10.py

Add generator/verify script teleop_openarm_demo_simready_warehouse_task_9.py

Add generator/verify script _downscale_textures.py

Add generator/verify script package_task9_background.py

Add generator/verify script export_task9_scene_usd.py