Add eval for the issue-to-mr flow

What does this merge request do and why?

• adds a new eval pipeline to test the issue_to_merge_request flow.
• adds a new data collector based on the duo-workflow-service (DWS) api, which delegates the execution of duo-worflow-executor to DWS.
• adds a new simple boolean evaluator that checks if a merge request was created.

How to set up and validate locally

1. Setup DAP in gdk with Remote Flows enabled (thus make sure you have a gitlab runner active in the tested project)
2. On gitlab switch to branch bc/issue-to-mr-seeder and run the data seeder:

bundle exec rake gitlab:duo:dap_evals_seeder

3. Now on CEF, run the eval as:

poetry run cef agent-platform evaluate .gitlab/agent_platform_templates/issue-to-mr.yaml

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.