remove the largeTensorTest hook

[daisyden]

As torch.testing._internal.common_device_type.largeTensorTest already supports xpu, remove the hook in test code.

[Copilot]

Pull Request Overview

This PR removes custom XPU-specific hooks for the largeTensorTest function, as the upstream PyTorch common testing utilities now natively support XPU devices. The changes simplify the XPU test infrastructure by eliminating redundant device translation logic.

• Removes the largeTensorTest attribute assignment in the XPUPatchForImport constructor
• Eliminates the lambda function that redirected CUDA device calls to XPU in the __init__ method
• Removes the restoration of the original largeTensorTest function in the __exit__ method

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