Arm backend: Remove pyre-unsafe from _passes/

[Sebastian-Larsson]

Pyre is no longer used.

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15351

• 📄 Preview Python docs built from this PR

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❌ 8 New Failures, 3 Unrelated Failures

As of commit 3ed8d54 with merge base fdfeaa4 ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 8fa13bc80510741cb3d4a2c03e0c71bc01796633dfc0ed57152d81d539671d87 /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 7f1ce71c75a39736ed3caf9fc8d7e5284bdd4512e79647d57319e5a3dea01050 /exec failed with exit code 1
• Test CUDA Builds / export-gemma3-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t 7e7f719c3b87136b0436f1bc247f3b9f02d2fb961b04c47d5793dd1285a18e11 /exec failed with exit code 2
• Test CUDA Builds / export-gemma3-cuda-quantized-int4-tile-packed / linux-job (gh)
  RuntimeError: Command docker exec -t 9ae41907cc9a57db0adcde26a6057414f55c2c1462749dd3342c64e0ecfa0ade /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t 85bcecd6ea808698a162fcc8770140048364aafd892504323b7df906deba0087 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-tile-packed / linux-job (gh)
  RuntimeError: Command docker exec -t 33f88336a9cb327580c86b6b03cc334fe8237621618ab7a33046f2c4becfab26 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-weight-only / linux-job (gh)
  RuntimeError: Command docker exec -t cc8f036cff4440d1449b46d00e5828e8522f6dc017aac8676c339d6d7db1b274 /exec failed with exit code 2
• Test Metal Backend / export-voxtral-metal-artifact / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2

BROKEN TRUNK - The following jobs failed but were present on the merge base:

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

• pull / unittest / linux / linux-job (gh) (trunk failure)
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)

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