Revert "Add recurrent gated delta rule custom op for Qwen3.5 attentio…

[JacobSzwejbka]

This reverts commit 476a7ef.

Broke some stuff internally @digantdesai to reland

[pytorch-bot]

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NEW FAILURE - The following job has failed:

• pull / unittest-editable / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv2_model

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