Meta-issue: Testbed loose ends

[afourney]

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1. When Testbed scenarios are run in Docker, logs and files are owned by root. #592
   autogenbench +1
2. We need a way of re-running failed scenarios in the testbed (other than manually deleting their results folders)
3. Testbed scenarios need to be updated to cover GPT-4-1106 (turbo)
4. Add a group chat scenario to the Testbed. #673
   autogenbench +1
   
5. Add Testbed metrics for common errors (failure to terminate, failure detect code block, etc.)
6. Parameterize the version of pyautogen that gets installed in the Testbed Docker environment #662
   autogenbench +1
   

[afourney]

Superseded by #973