* Fix a few more license headers

I missed a few directories outside of src.

* Update Directory.Build.props

Prepare Core-Setup for repo consolidation (dotnet/core-setup#8709)

Commit migrated from https://github.com/dotnet/core-setup/commit/fd3b3421d7b901aaac28ad34e63b6480f88973d3

Copies the closure of C# code from the BuildTools repo that's necessary for the Core-Setup publish tasks. There are no changes except automatically removing and sorting the using statements.

Source: https://github.com/dotnet/buildtools/tree/dotnet/core-setup@55d43483866c7caeeace96355add3a9b12fa5795

Using the existing BuildTools code reduces the risk of behavior differences vs. trying to find equivalents in Arcade. The upcoming new Arcade-powered publish functionality makes short-term effort to deduplicate these tasks throwaway work.


Commit migrated from https://github.com/dotnet/core-setup/commit/ea269ba71cc53b8bf217f20953fcbad85647033b