Add linter for msbuild scripts

[jsturtevant]

There isn't one at the current moment but there is some work in progress: https://github.com/dotnet/msbuild/blob/main/documentation/specs/proposed/BuildCheck.md

The plan of release is in .net 9: https://github.com/dotnet/msbuild/blob/main/documentation/specs/proposed/BuildCheck.md#configuration

[jsturtevant]

docs moved to https://github.com/dotnet/msbuild/blob/main/documentation/specs/BuildCheck/BuildCheck.md

[jsturtevant]

can be invoked with dotnet msbuild -check

Currently there are 36 issues, mostly in the test projects. I haven't dug into the issues to see if they are valid

Build succeeded with 36 warning(s) in 45.0s