chore: deprecate IJavaScriptExecutionHandler2 interface

Author: barjonp

src/Runtime/Runtime/APP_SUPPORT/Cshtml5Initializer.cs

@@ -46,8 +46,8 @@ public static void Initialize()
             Initialize(new JavaScriptExecutionHandler());
         }
 
-        [Obsolete(Helper.ObsoleteMemberMessage + " Use DotNetForHtml5.Initialize(IWebAssemblyExecutionHandler) instead.")]
         [EditorBrowsable(EditorBrowsableState.Never)]
+        [Obsolete(Helper.ObsoleteMemberMessage + " Use DotNetForHtml5.Initialize(IWebAssemblyExecutionHandler) instead.", true)]
         public static void Initialize(IJavaScriptExecutionHandler2 executionHandler)
         {
             Initialize((IJavaScriptExecutionHandler)executionHandler);

src/Runtime/Runtime/__SPECIFIC__/IJavaScriptExecutionHandler.cs

@@ -33,8 +33,8 @@ public interface IWebAssemblyExecutionHandler : IJavaScriptExecutionHandler
         TResult InvokeUnmarshalled<T0, T1, T2, TResult>(string identifier, T0 arg0, T1 arg1, T2 arg2);
     }
 
-    [Obsolete(Helper.ObsoleteMemberMessage + " Use DotNetForHtml5.IWebAssemblyExecutionHandler instead.")]
     [EditorBrowsable(EditorBrowsableState.Never)]
+    [Obsolete(Helper.ObsoleteMemberMessage + " Use DotNetForHtml5.IWebAssemblyExecutionHandler instead.", true)]
     public interface IJavaScriptExecutionHandler2 : IJavaScriptExecutionHandler
     {
         TResult InvokeUnmarshalled<T0, TResult>(string identifier, T0 arg0);
@@ -56,16 +56,7 @@ public object ExecuteJavaScriptWithResult(string javaScriptToExecute)
             => _jsRuntime.ExecuteJavaScriptWithResult(javaScriptToExecute);
 
         public TResult InvokeUnmarshalled<T0, TResult>(string identifier, T0 arg0)
-        {
-#pragma warning disable CS0618
-            if (_jsRuntime is IJavaScriptExecutionHandler2 jsRuntime)
-#pragma warning restore CS0618
-            {
-                jsRuntime.InvokeUnmarshalled<T0, TResult>(identifier, arg0);
-            }
-
-            throw new NotSupportedException();
-        }
+            => throw new NotSupportedException();
 
         public TResult InvokeUnmarshalled<T0, T1, TResult>(string identifier, T0 arg0, T1 arg1)
             => throw new NotSupportedException();