Remove debug logging (#791)

* isBusy should not be serialized

Otherwise the UI might get locked out if Unity reloads in the middle
of an operation

* Remove debug logging from release code

Author: shana

src/UnityExtension/Assets/Editor/GitHub.Unity/UI/Window.cs

@@ -415,7 +415,6 @@ public override void UpdateProgress(IProgress progress)
 
         private void ApplicationManagerOnProgress(IProgress progress)
         {
-            Debug.LogFormat("ApplicationManagerOnProgress {0} {1}", progress.Percentage, progress.Message);
             appManagerProgress = progress;
             appManagerProgressHasUpdate = true;
         }