[code_review] Generate comments with multiple models/configs or multiple approaches

[marco-c]

An ensemble to generate more comments, with a filtering step to only output actually unique ones.
For example, GPT-4o + Mistral. Or, GPT-4o with the patch in the default order + GPT-4o with the patch in random order.

4028e2d was the first step for this.

This depends on #4580 for the evaluation.
This also depends on #4582 and #4587 to choose what to put in the mix.

[suhaibmujahid]

We have this as part of the experimental mode but without the filtering step. We return the results generated by each of the models/configurations to the user for evaluation.

The following are the configurations in the experimental mode:

• gpt-4o temp 0.2
• gpt-4o temp 0.8
• claude-3-5 temp 0.2
• gemini-1.5-pro temp 0.2 (disabled due to a quota limitation error)