Add bias tests for GPT OSS and standardize bias params naming

[cyrusd98]

Summary: No functional changes

Test Plan: CI Passes

Differential Revision: D86799190

[github-actions]

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[gemini-code-assist]

Code Review

This pull request standardizes the naming of bias parameters in torch_experts and torch_moe functions within tests/kernels/utils.py. The parameters b_bias1 and b_bias2 have been renamed to w1_bias and w2_bias respectively. This change improves clarity and consistency, as the new names better reflect their association with the weight tensors w1 and w2. The refactoring has been applied correctly and consistently throughout the file, enhancing code readability and maintainability. The changes are sound and I see no issues.

[yewentao256]

The idea looks good to me, what is the "Add bias tests for GPT OSS" you mentioned in the title?