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* xpu: support xpu backend from stock pytorch (>=2.4)

Fixes: https://github.com/huggingface/transformers/issues/31237

XPU backend is available in the stock PyTorch starting from
version 2.4, see [1]. This commit extends huggingface transformers
to support XPU from both IPEX and the stock pytorch. IPEX is being
tried first.

See: https://github.com/pytorch/pytorch/issues/114842
Requires: https://github.com/huggingface/accelerate/pull/2825

Signed-off-by: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>

* xpu: enable gpt2 and decision_transformer tests for xpu pytorch backend

Note that running xpu tests requires TRANSFORMERS_TEST_DEVICE_SPEC=spec.py
passed to the test runner:

  import torch
  DEVICE_NAME = 'xpu'
  MANUAL_SEED_FN = torch.xpu.manual_seed
  EMPTY_CACHE_FN = torch.xpu.empty_cache
  DEVICE_COUNT_FN = torch.xpu.device_count
Signed-off-by: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>

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Signed-off-by: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>