[XPU] Relax Muon float32 tolerance in test_state_dict_with_cuda_params

[gplutop7]

Fixes:
intel/torch-xpu-ops#1973

This PR adds an XPU-specific tolerance override for Muon in optimizer tests.

The override is scoped to TestOptimRenewed.test_state_dict_with_cuda_params for torch.float32 on xpu only.

This accounts for small, expected XPU versus CPU float32 accumulation differences observed in state_dict parity checks, while keeping behavior unchanged for all other devices and dtypes.

Prerequisite
Before landing this PR, merge intel/torch-xpu-ops#3690 first.
That change is required so XPU test override naming matches DecorateInfo test-name matching.

[pytorch-bot]

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[guangyey]

cc @daisyden
I noticed that test_state_dict_with_cuda_params is marked as onlyCUDA. We need to include this PR when generalizing test_state_dict_with_cuda_params.