VS: Add missing label in C# project-build events

Steven Boswellrequested to merge
ulatekh/cmake:fix_issue_21440 into master

This should fix issue #21440 (closed), i.e. missing VCEnd label in C# project-build events.

Fixes: #21440 (closed)
Topic-rename: vs-csproj-scripts

Edited by Brad King

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