Fix XGLM loss computation (PyTorch and TensorFlow) (#35878)
* Fix XGLM loss computation (PyTorch and TensorFlow)
* Update expected output string in XGLM sample test
This updates the expected output string of test_xglm_sample for torch
2.0 to the correct one and removes the one for torch 1.13.1 + cu116
(transformers moved to torch 2.0 with PR #35358).
* Update expected output IDs in XGLM generation test