[ExecuTorch][llm] Add numerical kernel tests for quantized_moe_ffn

[digantdesai]

Stack from ghstack (oldest at bottom):

• [ExecuTorch][llm] Wire --use_moe_quantized_op through export pipeline and LLM config #21126
• [ExecuTorch][llm] Add MoE quantized custom op documentation #21125
• [ExecuTorch][llm] Fuse w1+w3 into single GEMM in quantized_moe_ffn #21124
• -> [ExecuTorch][llm] Add numerical kernel tests for quantized_moe_ffn #21123
• [ExecuTorch][llm] Add source-transform and Meta-kernel tests for MoE op #21122
• [ExecuTorch][llm] Add MoE source transformation with INT4 quantized packing #21121
• [ExecuTorch][llm] Add Meta kernel and registration probe for quantized_moe_ffn #21120
• [ExecuTorch][llm] Add quantized_moe_ffn custom op with C++ kernel #21119

Add TestQuantizedMoeFfnOp: 5 tests comparing custom op output against
a Python q-dq reference (sigmoid+bias, sigmoid no-bias, softmax,
single-token, route_scale=0.0).

Differential Revision: D102381999

[pytorch-bot]

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❗ 1 Active SEVs

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• Unrelated MacOS MPS test jobs time out (30 min) due to stale cpp_extension lock file poisoning self-hosted runners

❌ 4 New Failures, 2 Unrelated Failures

As of commit 69fdd7a with merge base 21554e5 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  extension/llm/custom_ops/test_quantized_moe.py::TestSourceTransform::test_buffers_stay_fp32_after_to_half
• pull / unittest / macos / macos-job (gh)
  extension/llm/custom_ops/test_quantized_moe.py::TestSourceTransform::test_3d_input_shape_preserved_through_forward
• pull / unittest-editable / linux / linux-job (gh)
  extension/llm/custom_ops/test_quantized_moe.py::TestSourceTransform::test_buffers_stay_fp32_after_to_half
• pull / unittest-editable / macos / macos-job (gh)
  extension/llm/custom_ops/test_quantized_moe.py::TestQuantizedMoeFfnOp::test_sigmoid_no_bias

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-arm-backend-no-driver (test_pytest_models_tosa) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.
• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.

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