Allow ciflow/binaries label to trigger wheel builds on PRs

[swolchok]

Following PR (#12425) broke Linux manywheel and there was no way to repro it on that PR; I just happened to catch it because the PR after that (#12468) triggered the manywheel build.

[swolchok]

Stack from ghstack (oldest at bottom):

• Use CMake EXPORT #8954
• Build cpuinfo as ExternalProject #12513
• Convert pthreadpool to ExternalProject #12468
• Build XNNPACK as an ExternalProject #12425
• -> Allow ciflow/binaries label to trigger wheel builds on PRs #12505

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12505

• 📄 Preview Python docs built from this PR

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❌ 1 New Failure

As of commit a31187e with merge base 615404f ():

NEW FAILURE - The following job has failed:

• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 46177cf7f4522e93db4dfc57f08cc2f4a50d0f0c21851bc681d2af2b3ff5cbff /exec failed with exit code 1

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