Refactor autoregressive model tests

[pstjohn]

Moves shared auto-regressive model tests to modeling_common, making it easier to add new auto-regressive models

Summary by CodeRabbit

• Tests

  • Expanded test suite with comprehensive generation testing for autoregressive models, including batched and beam search scenarios.
  • Enhanced test configuration flexibility with additional parameter override support.

• Bug Fixes

  • Improved numerical stability in expert routing calculations by maintaining float32 precision.

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