win_exec: refactor PS exec runner (#45334)

* win_exec: refactor PS exec runner

* more changes for PSCore compatibility

* made some changes based on the recent review

* split up module exec scripts for smaller payload

* removed C# module support to focus on just error msg improvement

* cleaned up c# test classifier code

test/integration/targets/win_module_utils/module_utils/Ansible.Test.cs

@@ -0,0 +1,26 @@
+//AssemblyReference -Name System.Web.Extensions.dll
+
+using System;
+using System.Collections.Generic;
+using System.Web.Script.Serialization;
+
+namespace Ansible.Test
+{
+    public class OutputTest
+    {
+        public static string GetString()
+        {
+            Dictionary<string, object> obj = new Dictionary<string, object>();
+            obj["a"] = "a";
+            obj["b"] = 1;
+            return ToJson(obj);
+        }
+
+        private static string ToJson(object obj)
+        {
+            JavaScriptSerializer jss = new JavaScriptSerializer();
+            return jss.Serialize(obj);
+        }
+    }
+}
+