Temporarily disable test-models-arm-zephyr

[digantdesai]

• It has been broken for more than a week
• PR Remove pinning to ET commit for Zephyr CI job  #13388 just results in a different failure
• Issue Reenable test-models-arm-zephyr #13547 to re-enable this.

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13548

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❌ 2 New Failures

As of commit 559df9b with merge base bd92f1a ():

NEW FAILURES - The following jobs have failed:

• trunk / test-huggingface-transformers-coreml (qwen3-1.7b|xnnpack|--quantize) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 138
• trunk / unittest-release / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 58b61d1c6fa107464e49ba6ec5ef73e06e7cf294c6eb17f8029c607bf061de98 /exec failed with exit code 56

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