[PTRun] Fix always show after executing context menu result (#21291)

* fix always show

* add tests

* remove workaround

src/modules/launcher/PowerLauncher/ViewModel/IMainViewModel.cs

@@ -0,0 +1,11 @@
+// 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.
+
+namespace PowerLauncher.ViewModel
+{
+    public interface IMainViewModel
+    {
+        void Hide();
+    }
+}