Reland torch-family pin centralization

[JacobSzwejbka]

Summary

This relands the torch-family pin centralization from #19155 on top of latest main. The current main pin values are preserved while moving the torch, torchvision, torchaudio, and torchcodec specs plus the wheel channel into torch_pin.py.

The weekly pin bump workflow now updates only NIGHTLY_VERSION and only when CHANNEL == "nightly", so release/test pin files are not clobbered. Install scripts, Docker setup, QNN wheel testing, model E2E audio setup, and Moshi/Mimi requirements now read the centralized helpers.

This PR was authored with Claude.

Test Plan

python -m py_compile torch_pin.py install_requirements.py install_executorch.py .github/scripts/update_pytorch_pin.py .ci/scripts/tests/test_torch_pin.py

python -m black --config /dev/null --check torch_pin.py install_requirements.py install_executorch.py .github/scripts/update_pytorch_pin.py .ci/scripts/tests/test_torch_pin.py

bash -n .ci/docker/build.sh .ci/docker/common/install_pytorch.sh .ci/scripts/utils.sh .ci/scripts/test_model_e2e.sh .ci/scripts/test_wheel_package_qnn.sh examples/models/moshi/mimi/install_requirements.sh

git diff --check -- .ci/docker/build.sh .ci/docker/common/install_pytorch.sh .ci/docker/ubuntu/Dockerfile .ci/scripts/test_model_e2e.sh .ci/scripts/test_wheel_package_qnn.sh .ci/scripts/utils.sh .github/scripts/update_pytorch_pin.py .github/workflows/weekly-pytorch-pin-bump.yml examples/models/moshi/mimi/install_requirements.sh install_executorch.py install_requirements.py torch_pin.py .ci/scripts/tests/test_torch_pin.py

python -m pytest -q .ci/scripts/tests/test_torch_pin.py -o addopts=

lintrunner could not run locally because this environment is missing lintrunner_adapters; the commit hook failed at lintrunner init for the same reason, after the pin sync completed successfully.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/19816

• 📄 Preview Python docs built from this PR

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

As of commit 98be870 with merge base 2f22959 ():

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• pull / test-qnn-python-imports-linux / linux-job (gh)

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

• pull / unittest / macos / macos-job (gh) (trunk failure)
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• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / unittest-release / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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