Update template to use Visual Studio 2026 tools

### What is the problem or limitation you are having?

The current Visual Studio template has been built using VSCode 2022 tooling. VSCode 2026 is out, and now uses v145 tools (rather than the previous v143 tools). It is possible to install v143 tools, but they're not installed by default.

In the week of June 8-June 15, the `windows-latest` image will be upgraded to use VSCode 2026.

### Describe the solution you'd like

An update to the Visual Studio template so that it is compatible with a default install of VSCode 2026.

### Describe alternatives you've considered

Stick permanently with VSCode 2022 as a base image. This is what is available on the `windows-2022` image. However, this isn't a long term solution.

### Additional context

The `windows-2025-vs2026` image can be used to opt into the new version in the short term.

Inspect the Visual Studio template and use the `windows-2025-vs2026` image to reproduce the tooling compatibility issue. Update the template so it works with the default Visual Studio 2026 v145 tools, then verify it builds successfully on the upgraded Windows image.

Written by the indexing model from the issue text.