Arm backend: Fix mypy warnings in test root dir

[perheld]

Signed-off-by: [email protected]
Change-Id: Ic27ab7b212765d597671b128b0cb3075ab64a548

[pytorch-bot]

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❌ 8 New Failures, 4 Unrelated Failures

As of commit fdf2dc1 with merge base bda5173 ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 3088bd88fb3c9e6454f5416904b91cadf90b58ee3ec59e7b3410d52d0051ea9a /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 67712a0c7c575205cff142efbb0a5b06f37e5fc77dc5ff70e787576227adef5d /exec failed with exit code 1
• Test CUDA Builds / export-gemma3-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t 1c3773f3c9fc4af71f5eaa637ef8d2dcb3ecab25f601dcf4dc141f8a6e96ae00 /exec failed with exit code 2
• Test CUDA Builds / export-gemma3-cuda-quantized-int4-tile-packed / linux-job (gh)
  RuntimeError: Command docker exec -t 6253b7974f2c144b510c0185cd8bb6f14f7d7a94c2d644bd041c55f8d491001b /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t 2a41f7d12dc98135079bfd16be3c5cb5d4116429c19ef34a0fde6e1858c47ea1 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-tile-packed / linux-job (gh)
  RuntimeError: Command docker exec -t 7103027a7ea1e5b8ac01f8a0eb19494c569ceb84bc11d787ad6dc23f706cc2e7 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-weight-only / linux-job (gh)
  RuntimeError: Command docker exec -t 5c953867c9a06ead825cb2ca8834888c548fcb1e7c064b1fb9c7445cccb7fdd0 /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 jobs failed but were likely due to flakiness present on trunk:

• trunk / test-models-linux-aarch64 (mv3, portable, linux.arm64.2xlarge) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• trunk / unittest-release / linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is 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 / linux / linux-job (gh) (trunk failure)
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)

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