Model support for `moco` with Torch_XLA2

[ManfeiBai]

Fix the model test for moco.py

1. setup env according to Run a model under torch_xla2
2. Run model test under run_torchbench/ with python models/your_target_model_name.py
3. Fix the failure.

Please refer to this guide as guide to fix:

Also refer to these PRs:

• https://github.com/pytorch/xla/pull/7583