De-duplicate APIBench eval data (?)

The evaluation data for APIBench is duplicated between data/apibench/*_eval.json and eval/eval-data/questions/. I think the only difference is formatting. Maybe we should just keep the eval/eval-data/responses and have data/apibench for only data used to train the model.

Initially we made two copies with the following rationale: apibench should have all the data self-contained, which the community is using to train/benchmark their LLMs. eval/ would have the eval data in a format that would be easy to eyeball and understand what is going on.

Maybe this is one of those few cases where it might be ok to have the same data twice in the repository in different formats?

Starting this issue in case anyone has comments on this.