Minor fixes around the Arm testing framework

[benkli01]

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[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/5976

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❌ 1 New Failure, 1 Unrelated Failure

As of commit aa98905 with merge base cb12061 ():

NEW FAILURE - The following job has failed:

• trunk / test-coreml-model / macos-job (gh)
  Library not loaded: @rpath/liblz4.1.dylib

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

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

• trunk / test-models-macos (cmake, llama2, xnnpack-delegation, macos-m1-stable, 90) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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@digantdesai merged this pull request in ec0fcee.