Fix build

Author: javiercn

src/Components/Server/test/Circuits/TestCircuitIdFactory.cs

@@ -7,7 +7,7 @@ namespace Microsoft.AspNetCore.Components.Server.Circuits;
 
 internal class TestCircuitIdFactory
 {
-    public static CircuitIdFactory? Instance { get; } = CreateTestFactory();
+    public static CircuitIdFactory Instance { get; } = CreateTestFactory();
 
     public static CircuitIdFactory CreateTestFactory()
     {

src/Components/test/testassets/TestContentPackage/PersistentCounter.razor

@@ -21,7 +21,7 @@
         public int Count { get; set; } = 0;
     }
 
-    protected override async Task OnInitializedAsync()
+    protected override void OnInitialized()
     {
         // State is preserved across disconnections
         State ??= new CounterState();