Fix test-llama-runner-qnn-linux tests

[davidlin54]

fix test-llama-runner-qnn-linux (fp32, qnn)

• add default value
• change pull.yml to reflect same changes in trunk.yml

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/7055

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❌ 2 New Failures, 1 Unrelated Failure

As of commit 84ea1c2 with merge base fbee0c8 ():

NEW FAILURES - The following jobs have failed:

• trunk / test-models-macos (cmake, mv3, portable, macos-m1-stable, 90) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / test-models-macos (cmake, vit, xnnpack-quantization-delegation, macos-m1-stable, 90) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script 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-coreml-delegate / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1

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[davidlin54]

@pytorchbot label "topic: misc"

[pytorch-bot]

Didn't find following labels among repository labels: topic: misc

[davidlin54]

@pytorchbot label "topic: not user facing"

[swolchok]

seems fine? if failures are unrelated, ship it