CopilotTask does not continue execution after returning a response

[ataibarkai]

Describe the bug
The CopilotTask successfully calls a function from the global context. But it does not pass the function's return value back into the execution context.

To Reproduce

• In the powerpoint presentation example, remove the words "do not carry research" from the task.
• See how a research task is successfully initiated when executing the CopilotTask.
• Once the research concludes, the task goes inert. The response is not fed back to the copilot engine, and a new slide is not appended.

Expected behavior
Same behavior as the chatbot.