[mxfp8 moe training] improve unit tests

[danielvegamyhre]

Stacked PRs:

• [mxfp8 moe training] bench and profile mxfp8 a2a fwd and bwd separately #3203
• ->[mxfp8 moe training] improve unit tests #3201
• [mxfp8 moe training] integrate triton quant/dequant kernels into mxfp8 all to all #3197
• [mxfp8 moe training] add triton kernel for mxfp8 dequantization #3195

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[mxfp8 moe training] improve unit tests

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/3201

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❌ 3 New Failures, 1 Cancelled Job, 1 Unrelated Failure

As of commit 6a2088a with merge base b644211 ():

NEW FAILURES - The following jobs have failed:

• PR Label Check / Check PR Labels (gh)
  Process completed with exit code 1.
• Run 1xH100 Tests / test (H100, linux.aws.h100, --pre torch torchvision torchaudio fbgemm-gpu-genai --index-url https... / linux-job (gh)
  RuntimeError: Command docker exec -t f297e96ef203e233734e441a883e28a7b369736c89170feceb1d8ac07a27ddc5 /exec failed with exit code 1
• Run Regression Tests (aarch64) / test-cpu-ops (macos-14) (gh)
  /Users/runner/miniconda3/envs/venv/lib/python3.10/site-packages/executorch/share/cmake/../../include/executorch/runtime/core/memory_allocator.h:143:21: error: no matching function for call to 'mul_overflows'

CANCELLED JOB - The following job was cancelled. Please retry:

• Run Regression Tests (aarch64) / test-cpu-ops (linux.arm64.2xlarge) (gh)
  ##[error]The operation was canceled.

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Run Regression Tests / test-nightly (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch --index-url https://downloa... / linux-job (gh) (trunk failure)
  test/dtypes/test_nf4.py::TestComm::test_comm

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