VS: Add custom VCEnd labels only in C# projects
!6801 (merged) introduces adds missing label in C# project-build events. However, that event would apply to Managed C++ projects too. This MR restricts the event to only C# projects.
See !6801 (comment 1098942) for details.
Issue: #21440 (closed)
Topic-rename: vs-csproj-scripts
Edited by Brad King