Extract SDK version from global.json in Versions.props (#6596)
Extract SDK version from global.json in Versions.props (#6596)

Instead of syncing the version in two places,
treat global.json as canonical and extract the SDK
version value from it in the build.

rainersigwald/msbuild,rainersigwald/msbuild,AndyGerlicher/msbuild,rainersigwald/msbuild,sean-gilliam/msbuild,sean-gilliam/msbuild,sean-gilliam/msbuild,AndyGerlicher/msbuild,AndyGerlicher/msbuild,AndyGerlicher/msbuild,sean-gilliam/msbuild,rainersigwald/msbuild