[RELEASE TEST] Read optimum-executorch pin from ci_commit_pins instead of hardcoding

[manuelcandales]

testing...

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18430

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❌ 2 New Failures, 4 Cancelled Jobs, 4 Unrelated Failures

As of commit b2aa9dd with merge base 8c0a60b ():

NEW FAILURES - The following jobs have failed:

• docker-builds / docker-build (executorch-ubuntu-22.04-cuda-windows, linux.g5.4xlarge.nvidia.gpu) (gh)
  Final attempt failed. Child_process exited with error code 1
• pull / unittest-arm-backend-with-no-deps (test_pytest_models_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t ed5653f8211e3d6d175587b35973621902ba687dba12b913162e680c0a48726a /exec failed with exit code 1

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / unittest / macos / macos-job (gh)
  ##[error]The operation was canceled.
• pull / unittest-editable / macos / macos-job (gh)
  ##[error]The operation was canceled.
• Test CUDA Windows Export and E2E / export-model-cuda-windows-artifact (nvidia, diar_streaming_sortformer_4spk-v2, non-quantized) / linux-job (gh)
• Test CUDA Windows Export and E2E / export-model-cuda-windows-artifact (nvidia, parakeet-tdt, quantized-int4-weight-only) / linux-job (gh)

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

• Test CUDA Windows Export and E2E / export-model-cuda-windows-artifact (mistralai, Voxtral-Mini-3B-2507, non-quantized) / linux-job (gh) (matched win rule in flaky-rules.json)
  ##[error]The operation was canceled.
• Test CUDA Windows Export and E2E / export-model-cuda-windows-artifact (mistralai, Voxtral-Mini-3B-2507, quantized-int4-weight-only) / linux-job (gh) (matched win rule in flaky-rules.json)
  ##[error]The operation was canceled.
• 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.
• Test CUDA Windows Export and E2E / export-model-cuda-windows-artifact (nvidia, parakeet-tdt, non-quantized) / linux-job (gh) (matched win rule in flaky-rules.json)
  ##[error]The operation was canceled.

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