Arm backend: Remove pyre-unsafe from tosa/, vgf/ and ethosu/

[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/15352

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 8 New Failures, 3 Unrelated Failures

As of commit e4dbfc3 with merge base 7215b88 ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t a0a0d8e84dab51e7d4e8fffade6098debdb8fa8eab6f9204c6ae78a5cef81bc9 /exec failed with exit code 1
• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t d2e77e234a12c21d4e6a500545535a50e09d37e60760ee7d06480b6c3648d4bb /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 73c748546e5ffed4c1b3a2d354a15623b75d3e53b8f0463e69e218800ec68d60 /exec failed with exit code 1
• Test CUDA Builds / export-gemma3-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t 635d48b9acebf8f9670261a2788f3d7bf7da8f9635f480d27e69079308886fb9 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t ade8e3248545b122cbdf78ecd0842c94da13982057dafcdc895a8ce9d8d0640a /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-tile-packed / linux-job (gh)
  RuntimeError: Command docker exec -t 31386ea51f20040ac1237fbff6bfd206b368677f1abc282ae8cf9147d70d73e2 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-weight-only / linux-job (gh)
  RuntimeError: Command docker exec -t 7c9a14d18ed456ad3509af8f5f1352793437bba42d648f63b5a09f2b6fa89709 /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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