Crash in the following example for the g1_29dof robot: example_robot_policy.py

[Kenny-Vilella]

Repro step:

• Run the following command: uv run -m newton.examples robot_policy --robot g1_29dof --physx
• The simulation would crash with the following error message:

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/home/kvilella/Documents/Codes/Newton/testing_plan/newton/examples/__main__.py", line 21, in <module>
    main()
  File "/home/kvilella/Documents/Codes/Newton/testing_plan/newton/examples/__init__.py", line 478, in main
    runpy.run_module(target_module, run_name="__main__")
  File "<frozen runpy>", line 229, in run_module
  File "<frozen runpy>", line 88, in _run_code
  File "/home/kvilella/Documents/Codes/Newton/testing_plan/newton/examples/robot/example_robot_policy.py", line 458, in <module>
    raise ValueError(f"PhysX policy/joint mapping not available for robot '{args.robot}'.")
ValueError: PhysX policy/joint mapping not available for robot 'g1_29dof'.