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[main] Source code updates from dotnet/dotnet (#66239)
Migrating to the new solution file format - .slnx (#61273)
Update https://docs.microsoft.com to https://learn.microsoft.com (#55970)
Favor project-specific build scripts over top-level script (#29918)
Add startvs for each solution (dotnet/extensions#2630)
Added VSCode debugging (for MvcSandbox) & code analysis support (#29486)
Add Bash scripts for launching VS Code with activated env (#33236)