Add troubleshoot slash command

What does this merge request do and why?

Root Causes Analysis has moved to /troubleshoot via Duo Chat. This change adds support to evaluation /troubleshoot.

Relates to #254 (closed) & #391 (closed)

How to set up and validate locally

1. Ensure GCP environment variables are setup.
2. Check out to this merge request's branch.
3. Make a copy of data/config/root_cause_analysis/eval_slash_troubleshoot_experiment.example.json.

   cp data/config/root_cause_analysis/eval_slash_troubleshoot_experiment{.example,}.json

4. Update the base_url to https://gitlab.com in the config. (We not yet support seeding local GDK).
5. Run the follow command to kick off the pipeline.

   poetry run promptlib duo-chat eval --config-file=data/config/root_cause_analysis/eval_slash_troubleshoot_experiment.json --test-run --sample-size 1

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.