Port: Fix issues with ExpectReplies and Invoke in SkillDialog

[EricDahlvang]

While adding BufferedReplies, type of InvokeResponse should be added to TurnState:

                        if (activity.Type == ActivityTypesEx.InvokeResponse)
                        {
                            TurnState.Add(BotFrameworkAdapter.InvokeResponseKey, activity);
                        }

microsoft/botbuilder-dotnet#4845

And, on the Skill Dialog side, only one InvokeResponse should be sent.

[gabog]

Hi @axelsrz, would you be able to address this one and fix it for the next R11 rc?

Thanks