Arm backend: Remove pyre-unsafe from operators/

[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/15376

• 📄 Preview Python docs built from this PR

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❌ 9 New Failures, 1 Cancelled Job, 2 Unrelated Failures

As of commit 9b47080 with merge base de56c81 ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t e4ae38ece12ed655606872ff9eb3629ec5a19e4f4e7657cdc182ccef5d601e79 /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 3f673d2af85db19c7041cb1fd3c8798309275a0a13b5134fdb425ea890eb35fa /exec failed with exit code 1
• Test CUDA Builds / export-gemma3-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t c3b9e720c244a8ea9c0a60c8b8869b7cde7eabf1b10bfcc14a39868c7270ade9 /exec failed with exit code 2
• Test CUDA Builds / export-gemma3-cuda-quantized-int4-tile-packed / linux-job (gh)
  RuntimeError: Command docker exec -t d9da4e96656543d350908b9dd859bc74bf0f8f9c9899d0d1bcd8de643203cb03 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t 8d7ce3a8b3fa418b0dd5dbcb6dc7abe50c4cb2948810d3b8fad9e87fb9262842 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-tile-packed / linux-job (gh)
  RuntimeError: Command docker exec -t 5fe2228a8d26d5aba026858a13d0dbcae8b9640e3dcff5d51121cc991c3c6474 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-weight-only / linux-job (gh)
  RuntimeError: Command docker exec -t 046cac5acb1be4ecbc6163e9ca194f1e73869298afce5ede33f397405fcaaa2a /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
• trunk / test-torchao-huggingface-checkpoints (qwen3_4b, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc1... / linux-job (gh)
  RuntimeError: Command docker exec -t 1c4519fb39189a118a3af6da4567ed0a0584eba2fb4136aec1071e81aefa744c /exec failed with exit code 2

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / unittest / linux / linux-job (gh)
  ##[error]The operation was canceled.

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

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