Remove benchmark scripts from git tracking

[digantdesai]

Stack from ghstack (oldest at bottom):

• Add structured stats reporting and GPU memory tracking to Qwen3.5 MoE runner #19190
• -> Remove benchmark scripts from git tracking #19189
• Add Triton INT4 dense kernels with dequant prefill path for Qwen3.5 MoE #19188
• Add W4A8 INT8 activation kernels for batched MoE prefill #19187

These are local development tools, not production code.

Co-authored-by: Claude noreply@anthropic.com

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/19189

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❗ 1 Active SEVs

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• Rolling out OSDC (ARC) runners on pull & trunk workflows in PyTorch main

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

As of commit b3352c6 with merge base cb4e5ae ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-arm-backend-with-no-deps (test_pytest_ops_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t 9f45b5a252bfa6bc08178b8f772058f6f29ee3fc052ebaac86171a5c6d818af9 /exec failed with exit code 1
• Test CUDA Builds / unittest-cuda / linux-job (gh)
  [ FAILED ] AOTITorchCudaRandTest.RandBFloat16Basic
• Test CUDA Windows Export and E2E / export-model-cuda-windows-artifact (facebook, dinov2-small-imagenet1k-1-layer, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t 3930c36798c8ff0d73bef0f15d52043f5be1f182bb39f374f6ec14ab1ddf2b3f /exec failed with exit code 1
• Test CUDA Windows Export and E2E / export-model-cuda-windows-artifact (nvidia, parakeet-tdt, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t 6c25efaa6398eaf63e3ea17ed3788fb021c35f13f81a3c3831d26c9bc2a112b2 /exec failed with exit code 1
• Test CUDA Windows Export and E2E / export-model-cuda-windows-artifact (nvidia, parakeet-tdt, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t cfdbd9f2891636784400b73de68e76363617d0171ce7689ca221a4229f0f36ad /exec failed with exit code 1

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

• pull / test-phi-3-mini-runner-linux / linux-job (gh)
  ##[error]The operation was canceled.

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Test CUDA Windows Export and E2E / export-model-cuda-windows-artifact (mistralai, Voxtral-Mini-4B-Realtime-2602, quantized-int4-tile... / linux-job (gh) (matched win rule in flaky-rules.json)
  ##[error]The operation was canceled.

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