Fix Windows CI CMake configure step for hosted runner compatibility

[Copilot]

The build-windows Actions job failed during CMake configure because the workflow pinned a Visual Studio generator (Visual Studio 17 2022) that is not guaranteed on current windows-latest images. This change removes the hardcoded generator so CMake can select an available toolchain on the runner.

• CI workflow update

  • Updated .github/workflows/cpp-build.yml in build-windows to stop forcing a specific Visual Studio generator.
  • Kept the rest of the Windows build/test flow unchanged.

• Failure mode addressed

  • Eliminates runner-image coupling that caused:
    • could not find any instance of Visual Studio

• Change snippet

  # before
  cmake .. -G "Visual Studio 17 2022" -DCMAKE_BUILD_TYPE=Release
  
  # after
  cmake .. -DCMAKE_BUILD_TYPE=Release