Move duo-chat make-dataset-2 to config system

What does this merge request do and why?

Follow-up on https://gitlab.com/gitlab-org/modelops/applied-ml/code-suggestions/prompt-library/-/merge_requests/147#note_1683670687.

Make duo-chat make-dataset-2 config file based.

How to set up and validate locally

1. Run the pipeline

poetry run promptlib duo-chat make-dataset-2 --config-file data/config/duochat_make_dataset_2_config.json.example

Merge request checklist

• I've ran the affected pipeline(s) to validate that nothing is broken.
• Tests added for new functionality. If not, please raise an issue to follow up.
• Documentation added/updated, if needed.