Run Python unit test CI on Windows

[GregoryComer]

(WIP)

Run unit test CI on Windows. There are a few differences in the CI build environment. I've updated the setup.py logic to handle both.

[GregoryComer]

Stack from ghstack (oldest at bottom):

• -> 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/13716

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❌ 19 New Failures, 1 Pending

As of commit 480f09c with merge base 4c4cbdf ():

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 c4d3835461cedbc7a52c4009d7b8de3f3c97807a432d26878dcb36cde51d9f82 /exec failed with exit code 3
• pull / unittest / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3
• pull / unittest / windows / windows-job (gh)
  Process completed with exit code 1.
• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t 7beb3286fef175c7d16a3153c2182095f67de53bcafc384bec11c18704309985 /exec failed with exit code 3
• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  RuntimeError: Command docker exec -t b424106fcdcb8c8a12c36dffc25c9e0a8ff28fb4cac90313be0df90cb8de03a8 /exec failed with exit code 3
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 790355b75d577e1c18ea34ae70097fd072d5a618fc6679461307bf03254ffc3a /exec failed with exit code 3
• pull / unittest-editable / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3
• pull / unittest-editable / windows / windows-job (gh)
  Process completed with exit code 1.
• trunk / test-arm-backend (test_pytest_models_ethosu_fvp) / linux-job (gh)
  RuntimeError: Command docker exec -t 825d05a442eb26296fa9f991bb38f7dc5ca0f161430b87977ce7b11320a5dbaf /exec failed with exit code 3
• trunk / test-arm-backend (test_pytest_ops_ethosu_fvp) / linux-job (gh)
  RuntimeError: Command docker exec -t c2b2106352cebe0ac8e4db87514a970e72038da403e925ce13a72dfc79743a4e /exec failed with exit code 3
• trunk / test-arm-backend (test_smaller_stories_llama) / linux-job (gh)
  RuntimeError: Command docker exec -t e9b21a2c48e963dd7d33e086aea0f02970ae55421faf361bae03d199ccdfea01 /exec failed with exit code 3
• trunk / test-coreml-delegate / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• 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 (qwen3-1.7b|xnnpack|--quantize) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 138
• trunk / test-mcu-models (cmake) / linux-job (gh)
  RuntimeError: Command docker exec -t 3dbf4965ff091ef4513bc95bd5a24fc0790c9c69416c686470ff451ecc699c1a /exec failed with exit code 1
• trunk / unittest-release / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 6d8df2da0f652b0dd5e1ca7bf2f21d93fa3fce91b5cc5e193b519a4aa62fb944 /exec failed with exit code 3
• trunk / unittest-release / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3
• trunk / unittest-release / windows / windows-job (gh)
  Process completed with exit code 1.

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