Resolve "Adding "baseline" as default output for transformation"

What does this merge request do and why?

This MR adds logic in the current pipeline to output "baseline" if there are no transformations given in the CLI.

How to set up and validate locally

Here is how I validated locally:

This has been validated with no transformation input, a single transformation input, and multiple transformation inputs using the code-gecko@latest model with the rust language.

Merge request checklist

• I've ran the eval_codebase.py pipeline 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.

Closes #59 (closed)