[release/0.7 only] Fix check_c10_sync being out of sync

[swolchok]

pytorch/pytorch#157418 was picked to the PyTorch 2.8 branch and puts us out of sync with c10. This re-syncs. I did a mass find/replace of torch/standalone with torch/headeronly; hopefully that caught everything.
.ci/scripts/check_c10_sync.sh now reports success.

[pytorch-bot]

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❌ 1 New Failure, 3 Cancelled Jobs, 1 Pending

As of commit 927e8f2 with merge base de24489 ():

NEW FAILURE - The following job has failed:

• trunk / unittest-release / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_gelu.py::TestGelu::test_fp16_gelu

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

• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (mobilebert, portable, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (mobilebert, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.

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[swolchok]

trunk / unittest-release / macos / macos-job (pull_request) looks like a flake