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Clean up some custom awaiters (#48722)
Use Visual Studio fix to add missing license headers
Enforce warnings for unused usings (#39280)
Use file scoped namespaces (#38076)
Stateful Reconnect API changes (#50092)
Rename Microsoft.Aspnetcore.Testing to Microsoft.AspNetCore.InternalTesting (#51713)
Treat all ProjectRefs to SharedFx projects as PrivateAssets=all (#64863)
Add rule to seal internal and private types (#41457)
Use new System.Net.ServerSentEvents package in SignalR (#56206)