Changed paths:
M ci/windows/build.cmd
M ci/windows/prepare.cmd
M ci/windows/test.cmd
Log Message:
-----------
Do not hardcode paths to Visual Studio installation
On 2026-06-15 Github switched the `windows-2025` runner to mean instead
`windows-2025-vs2026`^[1]. This caused our Windows CI job to break since
it hardcoded the path to the Visual Studio installation.
This patch instead switches scripts over to use the environment variable
`VSINSTALLDIR` instead which is set up by our CI environment.