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[main] Source code updates from dotnet/dotnet (#67642)
Put package assets in TFM-specific folder (#58995)
Clean up remaining `net461` references (#37731)
Drop Microsoft.AspNetCore.Grpc.Swagger (#67919)
Add README.md for gRPC project area (#27636)
Add gRPC JSON transcoding (#40242)
Favor project-specific build scripts over top-level script (#29918)
Migrate to single sln file + slnf files (#23581)