[Backend Tester] Add QNN test flow to nightly CI

[GregoryComer]

No description provided.

[GregoryComer]

Stack from ghstack (oldest at bottom):

• -> [Backend Tester] Add QNN test flow to nightly CI #13468
• Link QNN backend to pybinding lib when built #13467
• [Backend Tester] Run Core ML tests in nightly CI #13446
• [Backend Tester] Run Vulkan tests in nightly CI #13445
• [Backend Tester] Mark adaptive avgpool2d as an unsupported portable op #13398
• [Backend Tester] Add nightly CI job for XNNPACK #13390

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13468

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 12 New Failures, 1 Unrelated Failure

As of commit 7f15e20 with merge base bc5186c ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• Lint / lintrunner / linux-job (gh)
  >>> Lint for CMakeLists.txt:
• pull / test-llava-runner-linux / linux-job (gh)
  RuntimeError: Command docker exec -t d316dac988d4c3aa823e877d9ee9095b0514a9263eca1de048487e12625a13b1 /exec failed with exit code 139
• trunk / test-arm-backend (test_pytest_ops_ethosu_fvp) / linux-job (gh)
  RuntimeError: Command docker exec -t 514f41766a6470245a22fbc36f112299ef8823bff22faa81a28fa17b8aee384d /exec failed with exit code 1
• trunk / test-huggingface-transformers-coreml (llama3.2-1b|xnnpack|--quantize) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 139
• trunk / test-huggingface-transformers-coreml (olmo-1b|coreml_fp32_gpu|--quantize) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• trunk / test-huggingface-transformers-coreml (phi4-mini|xnnpack|--quantize) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 138
• 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 1
• trunk / test-models-arm-zephyr (add) / linux-job (gh)
  RuntimeError: Command docker exec -t 34783cf70e5560d9383dca090c6625473be82ac9f6c10a4179937a7470fc8772 /exec failed with exit code 1
• trunk / test-models-arm-zephyr (mv2) / linux-job (gh)
  RuntimeError: Command docker exec -t 442f53be45a1d52d0a1169174cc20851fdb354fc601441c769d09d24ecf4f1f0 /exec failed with exit code 1
• trunk / test-models-arm-zephyr (softmax) / linux-job (gh)
  RuntimeError: Command docker exec -t a379d2c331545eae709d0e3a1b3552e77b26815942932267420e07b1eedb1e9f /exec failed with exit code 1
• trunk / test-models-macos-coreml (w2l) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 134

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 (qwen3-0.6b|xnnpack|--quantize) / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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