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Changed default server for samples from IIS Express to Kestrel (#29517)
Reorganize source code in preparation to move into aspnet/AspNetCore Prior to reorganization, this source code was found in https://github.com/aspnet/SignalR/tree/c852bdcc332ffb998ec6a5b226e35d5e74d24009
Enforce warnings for unused usings (#39280)
Fix transitive framework references in sample projects (#65560)
Suppress by-design CodeQL alerts (#67713)