Io abstraction (#7293)

Co-authored-by: p-storm <paul.de.man@gmail.com>

src/tests/win-app-driver/FancyZonesTests/EditorTemplatesApplyTests.cs

@@ -1,4 +1,4 @@
-using System.IO;
+using System.IO.Abstractions;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Newtonsoft.Json.Linq;
 
@@ -7,6 +7,9 @@ namespace PowerToysTests
     [TestClass]
     public class FancyZonesEditorTemplatesApplyTests : FancyZonesEditor
     {
+        private static readonly IFileSystem FileSystem = new FileSystem();
+        private static readonly IFile File = FileSystem.File;
+
         private void ApplyLayout(string tabName)
         {
             editorWindow.FindElementByName(tabName).Click();