[stylecop] program plugin/unit test first pass (#5908)

* initial pass

* multiple whitespace fixes

src/modules/launcher/Plugins/Microsoft.Plugin.Program/SuffixesConverter.cs

@@ -1,4 +1,8 @@
-using System;
+// 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;
 using System.Globalization;
 using System.Windows.Data;
 using System.Windows.Markup;