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/library/csharp_util.ps1

@@ -0,0 +1,12 @@
+#1powershell
+
+#Requires -Module Ansible.ModuleUtils.Legacy
+#AnsibleRequires -CSharpUtil Ansible.Test
+
+$result = @{
+    res = [Ansible.Test.OutputTest]::GetString()
+    changed = $false
+}
+
+Exit-Json -obj $result
+