SignalRJsonProtocolTest

Issue: Blazor apps under .NET8.0 force HubConnections clients to establish connections under JsonProtocol 2.

Steps to reproduce:

1. Run all projects.

2. The console app uses Json Protocol 1 and can connect to the SignalR Hub.

3. The blazor app under .NET 7 uses Json Protocol 1 and can connect to SignalR Hub.

4. The blazor app under .NET 8 uses Json Protocol 2 and can't connect to the SignalR hub which doesn't supports JsonProtocol 2.