Update to .NET 10

[wtgodbe]

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

• [x] Update branding: https://github.com/dotnet/aspnetcore/pull/57340
  • [ ] Turn GRPC & HttpSys Microbenchmark validation back on
• [x] Update TFM after runtime updates theirs: https://github.com/dotnet/aspnetcore/pull/58090
• [ ] Use a .NET10 SDK - https://github.com/dotnet/aspnetcore/pull/58425
• [ ] Mark API from 9.0 as shipped
  • [x] release/9.0: https://github.com/dotnet/aspnetcore/pull/58060
  • [ ] main: Port https://github.com/dotnet/aspnetcore/pull/58060 on November 12 (RTM day)

After RTM ships:

• [ ] Add 9.0 SiteExtensions package to main
• [ ] Update package baseline
• [ ] Add PackageOverrides.txt, PlatformManifest.txt to 9.0