Add WSL runners to CI test matrix

[leofang]

Summary

• Add FLAVOR support to the Linux test workflow's runs-on field — defaults to linux but can be overridden per matrix entry (e.g. wsl)
• Add two WSL runner entries to ci/test-matrix.yml under a new # WSL runners section:
  • py 3.11, CUDA 12.9.1, T4
  • py 3.12, CUDA 13.2.0, RTX 4090

Closes #1039

Test plan

• Verify the WSL runners are picked up in the CI matrix
• Confirm existing (non-WSL) runners are unaffected (no FLAVOR set → defaults to linux)
• Run a test workflow on the WSL runners to validate end-to-end

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[leofang]

/ok to test e7fb7ef

[leofang]

/ok to test afbd15d

[leofang]

@jrcichra it seems to just work ™️ 🎉

Q: the "latest" driver is CUDA 13.0 on WSL?

[cryos]

LGTM

[jrcichra]

@jrcichra it seems to just work ™️ 🎉

Q: the "latest" driver is CUDA 13.0 on WSL?

Yes, we are preinstalling this (on the Windows OS running WSL):

+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 580.126.02             Driver Version: 582.16         CUDA Version: 13.0     |
+-----------------------------------------+------------------------+----------------------+

[github-actions]

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