[Windows] Add model run CI

[GregoryComer]

Add Windows CI jobs to test models. From looking at the existing CI, it looks like our model test jobs are pretty minimal and don't verify much other than it runs without crashing. I'd like to re-visit this in the near future and integrate with the new test harness, but for the purpose this PR, I'm just matching the Windows jobs to what the Linux jobs do.

[GregoryComer]

Stack from ghstack (oldest at bottom):

• [Windows] Add CI wheel build jobs for Windows #13837
• -> [Windows] Add model run CI #13836
• [Windows] Run Python unit test CI on Windows #13716

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13836

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❗ 1 Active SEVs

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• ROCm MI2xx CI/CD workflows failing due to : download from https://api.github.com/repos/pytorch/pytorch timed out.

❌ 9 New Failures, 1 Cancelled Job, 7 Unrelated Failures

As of commit 8ce15a3 with merge base 1520f9f ():

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
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 66cd21ebac2a1eeb782107347ae2dcc0d0e6ee774be3bfec56133b88a9a7ef67 /exec failed with exit code 1
• pull / unittest / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 2d80c313d106c2df8cca28dc31724823c2bd0e92e7358517587ba830a6a08bcf /exec failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / test-coreml-delegate / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• trunk / test-llama-torchao-lowbit / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2
• trunk / unittest-release / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 33e1e7b1d860b5034295935cb0f0fbca2341728129132a39cd6905ba5e3a880e /exec failed with exit code 1
• trunk / unittest-release / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• trunk / test-llama-runner-mac (fp32, coreml) / macos-job (gh)
  ##[error]The operation was canceled.

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

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

• trunk / test-arm-backend (test_models_ethos-u55) / linux-job (gh) (trunk failure)
  AttributeError: 'bool' object has no attribute 'lower'
• trunk / test-arm-backend (test_models_ethos-u85) / linux-job (gh) (trunk failure)
  AttributeError: 'bool' object has no attribute 'lower'
• trunk / test-arm-backend (test_models_tosa) / linux-job (gh) (trunk failure)
  AttributeError: 'bool' object has no attribute 'lower'
• trunk / test-huggingface-transformers-coreml (qwen3-1.7b|xnnpack|--quantize) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• trunk / test-llama-runner-mac (fp32, mps) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2
• trunk / test-llama-runner-mac (fp32, xnnpack+custom+quantize_kv) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2
• trunk / test-mcu-models (cmake) / linux-job (gh) (trunk failure)
  AttributeError: 'bool' object has no attribute 'lower'

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