[Blazor] Fixes reliability issues in the blazor reliability tests (#15223)

Some tests get stuck when run on the CI likely due to spikes on the CI machine load. This fix doubles the startup timeout of the reliability tests to account for that.

src/Components/Ignitor/src/BlazorClient.cs

@@ -31,7 +31,7 @@ namespace Ignitor
             });
         }
 
-        public TimeSpan? DefaultConnectionTimeout { get; set; } = TimeSpan.FromSeconds(10);
+        public TimeSpan? DefaultConnectionTimeout { get; set; } = TimeSpan.FromSeconds(20);
         public TimeSpan? DefaultOperationTimeout { get; set; } = TimeSpan.FromMilliseconds(500);
 
         /// <summary>