Made Plugin Folder Unit tests & Expanding enviroment search (#6600)

* Made Plugin Folder Unit tests. Fixes '>' not recursive searching (with max). Added that paths with an UnauthorizedAccessException are ignored. Added expanding enviroment search.

* Fixed some merging errors

* Added feedback from review

* Made the change that  ryanbodrug-microsoft suggested

* Stupid merge request... fixed

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

src/modules/launcher/Plugins/Microsoft.Plugin.Folder/UserFolderProcessor.cs

@@ -0,0 +1,38 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.Plugin.Folder.Sources;
+using Microsoft.Plugin.Folder.Sources.Result;
+
+namespace Microsoft.Plugin.Folder
+{
+    internal class UserFolderProcessor : IFolderProcessor
+    {
+        private readonly FolderHelper _folderHelper;
+
+        public UserFolderProcessor(FolderHelper folderHelper)
+        {
+            _folderHelper = folderHelper;
+        }
+
+        public IEnumerable<IItemResult> Results(string actionKeyword, string search)
+        {
+            return _folderHelper.GetUserFolderResults(search)
+                .Select(item => CreateFolderResult(item.Nickname, item.Path, item.Path, search));
+        }
+
+        private static IItemResult CreateFolderResult(string title, string subtitle, string path, string search)
+        {
+            return new UserFolderResult
+            {
+                Search = search,
+                Title = title,
+                Subtitle = subtitle,
+                Path = path,
+            };
+        }
+    }
+}