Adding a `output_task_messages` to `run_stream` methods to avoid messages in `task` are included.

### Confirmation

- [x] I confirm that I am a maintainer and so can use this template. If I am not, I understand this issue will be closed and I will be asked to use a different template.

### Issue body

Help `SocietyOfMindAgent` to avoid fragile counting-based skipping of task messages. Also, it makes it easier to nest agent teams within teams. 