Upgrade GitHub Actions runner images to windows-2025#805

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check,ci/runner,images,github,actions/improvement/windows-2025,upgrade,windows-sdks/5.15.2026,arlodotexe

Commits on May 19, 2026

Remove manual Windows SDK install from CI, use only preinstalled 26100 SDK
Arlodotexe
committed
Bump tooling pointer to include ISO-based SDK installer
Arlodotexe
committed
Use ISO-based Windows SDK installer in CI, target 19041
Arlodotexe
committed