Prefer $(DefaultPlatformToolset) instead of guessing based on IDE (#775)

Prefer $(DefaultPlatformToolset) instead of guessing based on IDE (#775)

* Prefer $(DefaultPlatformToolset) instead of guessing based on detected IDE

Also bump up fallback to 2026.

* Pass platform toolset to dependency projects

This ensures they're all built using the same toolset, where it can differ,
e.g. when using VS2022 on a system where VS2026 is also installed.

Also fold the build directories up a level (e.g. Debug-x64\, rather than x64\Debug\),
so we can continue to use the official binaries for testing (they're hard-patched for ../MAP/ etc).

* build_msbuild_all.yml: Update test binary path

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