Fix buck cquery //extension/llm/runner: in OSS

[swolchok]

More missing use of get_aten_mode_options.

[swolchok]

Stack from ghstack (oldest at bottom):

• Add check_for_installed_private_headers_in_cmake_out #13485
• -> Fix buck cquery //extension/llm/runner: in OSS #13527

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13527

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❌ 4 New Failures, 1 Unrelated Failure

As of commit 7a6747f with merge base 0856f59 ():

NEW FAILURES - The following jobs have failed:

• trunk / test-huggingface-transformers-coreml (qwen3-0.6b|xnnpack|--quantize) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 139
• trunk / test-models-arm-zephyr (add) / linux-job (gh)
  RuntimeError: Command docker exec -t de15df0848a24b9f253ba282b32cd0a1b441e734e3a55bfd31276ebeb09c9544 /exec failed with exit code 1
• trunk / test-models-arm-zephyr (mv2) / linux-job (gh)
  RuntimeError: Command docker exec -t cc0e84ecb841c7cce0c3e4ac11a5e271e4fdb66e9a8df1651cd959fe21b7ce1d /exec failed with exit code 1
• trunk / test-models-arm-zephyr (softmax) / linux-job (gh)
  RuntimeError: Command docker exec -t d59495db16120b65b8788fa132b1199ab5b47b9908e5bb977390d96907b21d4c /exec failed with exit code 1

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-huggingface-transformers-coreml (olmo-1b|coreml_fp32_gpu|--quantize) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1

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