Run Python unit test CI on Windows

[GregoryComer]

I'm temporarily disabling tokenizers on Windows, as it does not currently build. I'll address this as a follow-up. It may be as simple as building with Clang. Since it's built through install_requirements.py -> pip, I need to figure out how to pass the toolset variable into the inner CMake build. May by a simple change in the tokenizers repo setup.py.

[GregoryComer]

Stack from ghstack (oldest at bottom):

• -> Run Python unit test CI on Windows #13567
• Disable tokenizers on Windows #13667
• Fix data loader build on Windows, re-enable pybind job #13564
• Fix portable library build on Windows #13260
• Fix XNNPACK build on Windows #13259
• Fix build on Windows, re-enable Windows build CI job #13672

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13567

• 📄 Preview Python docs built from this PR

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❌ 9 New Failures, 3 Unrelated Failures

As of commit 607abf9 with merge base 484ed13 ():

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
• Build Presets / windows (windows) / build (gh)
• Lint / lintrunner / linux-job (gh)
  >>> Lint for CMakeLists.txt:
• pull / test-binary-size-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 01f4a3b3bb1832b51240848511920069ce8d883cae1e63e200862919bf17b1e7 /exec failed with exit code 1
• pull / unittest / windows / windows-job (gh)
  Process completed with exit code 1.
• pull / unittest-buck / windows / windows-job (gh)
  Process completed with exit code 1.
• pull / unittest-editable / windows / windows-job (gh)
  Process completed 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 139
• trunk / unittest-release / windows / windows-job (gh)
  Process completed with exit code 1.

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

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

• pull / unittest / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / unittest-release / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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