Arm backend: Remove pyre-unsafe from quantizer/ & backends/arm

[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/15374

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❌ 8 New Failures, 3 Unrelated Failures

As of commit 4785e42 with merge base de56c81 ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t d7f865014e1cd9e637bb4924a2c8c24ed331b2923851a89c7b0c0171d671c899 /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t fe9537e25cb51bc6397d76ff0ff68377cdb203291542cb732beb1c513a0376a3 /exec failed with exit code 1
• Test CUDA Builds / export-gemma3-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t 3a4aac9930346185ae993c1b9c4c96bea4de8d0a11b46eb3f39149c6b6769593 /exec failed with exit code 2
• Test CUDA Builds / export-gemma3-cuda-quantized-int4-tile-packed / linux-job (gh)
  RuntimeError: Command docker exec -t ef17cf4e442883ca3fc7221c7fa307adad8ba1a237512ef987d5303e82e5cf38 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t 909d606eed07fb2fc95bdf24dc120bc93dc7c195ffae3fb12673db2588d87e07 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-tile-packed / linux-job (gh)
  RuntimeError: Command docker exec -t cbfce7acb6c9d9c31eefc9aaa4a2df50a753a3af9d7b9dfc9018d2d6e3034cfb /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-weight-only / linux-job (gh)
  RuntimeError: Command docker exec -t 8cf940c9427d1c923345583e456cff19219b06e5e48fc4b2e95e7a2e352d2233 /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

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / unittest / linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

BROKEN TRUNK - The following jobs failed but was 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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