[tests] enable cuda-only tests in test_common_gpu.py to work on XPU

[faaany]

Below are the UT Results after the fix:

PASSED tests/test_common_gpu.py::PeftGPUCommonTests::test_adalora_bnb_quantization_from_pretrained_safetensors
PASSED tests/test_common_gpu.py::PeftGPUCommonTests::test_apply_GS_hra_inference
PASSED tests/test_common_gpu.py::PeftGPUCommonTests::test_dora_ephemeral_gpu_offload
PASSED tests/test_common_gpu.py::PeftGPUCommonTests::test_dora_ephemeral_gpu_offload_multigpu
PASSED tests/test_common_gpu.py::PeftGPUCommonTests::test_ia3_bnb_quantization_from_pretrained_safetensors
PASSED tests/test_common_gpu.py::PeftGPUCommonTests::test_lora_bnb_quantization_from_pretrained_safetensors
PASSED tests/test_common_gpu.py::PeftGPUCommonTests::test_r_odd_hra_inference
PASSED tests/test_common_gpu.py::PeftGPUCommonTests::test_serialization_shared_tensors

[faaany]

Hi @BenjaminBossan, pls have a review. I only enabled those that don't require BNB and auto-gptq, as BNB on XPU is not ready yet. I will submit a follow-up PR when BNB is ready on XPU.

[HuggingFaceDocBuilderDev]

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[BenjaminBossan]

Thanks, LGTM.