Update to .NET 11

[wtgodbe]

Follow steps in https://github.com/dotnet/aspnetcore/blob/main/docs/UpdatingMajorVersionAndTFM.md

• Update branding
  • Turn GRPC & HttpSys Microbenchmark validation back on
• Update TFM, no later than when runtime updates theirs
• Use a .NET11 SDK
• Mark API from 10.0 as shipped
  • release/10.0
  • main

After RTM ships:

• Add 10.0 SiteExtensions package to main
• Update package baseline
• Add PackageOverrides.txt, PlatformManifest.txt to 10.0