[SignalR] Fix a ServiceEndpoints binding bug that creating new persistent connections for each request (Azure#26165)

Author: Y-Sindo

sdk/signalr/Microsoft.Azure.WebJobs.Extensions.SignalRService/src/Bindings/SignalRInputBindings/SignalREndpointsInputBinding/SignalREndpointsAsyncConverter.cs

@@ -20,7 +20,9 @@ public SignalREndpointsAsyncConverter(IServiceManagerStore serviceManagerStore)
 
         public async Task<ServiceEndpoint[]> ConvertAsync(SignalREndpointsAttribute input, CancellationToken cancellationToken)
         {
-            var hubContext = await _serviceManagerStore.GetOrAddByConnectionStringKey(input.ConnectionStringSetting).ServiceManager.CreateHubContextAsync(input.HubName, cancellationToken: cancellationToken).ConfigureAwait(false) as IInternalServiceHubContext;
+            var hubContext = await _serviceManagerStore
+                .GetOrAddByConnectionStringKey(input.ConnectionStringSetting)
+                .GetAsync(input.HubName).ConfigureAwait(false) as IInternalServiceHubContext;
             return hubContext.GetServiceEndpoints().ToArray();
         }
     }