Making argument forwarding tests run with dotnet test and removing the its special test scripts.

test/ArgumentsReflector/Reflector.cs

@@ -0,0 +1,27 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+
+namespace Microsoft.DotNet.Tests.ArgumentForwarding
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            bool first=true;
+            foreach (var arg in args)
+            {
+                if (first)
+                {
+                    first=false;
+                }
+                else
+                {
+                    Console.Write(",");
+                }
+                Console.Write(arg);
+            }
+        }
+    }
+}