GraphQL setup: Basic Project and Merge request endpoint
What does this MR do?
This is based on the work done in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/13601.
It removes some logic from the types, uses existing logic in presenters.
Other TODO:
- Add 'full stack' tests for each query with all fields?
Does this MR meet the acceptance criteria?
- Changelog entry added, if necessary
- Documentation created/updated
- API support added
- Tests added for this feature/bug
- Conform by the code review guidelines
- Has been reviewed by a Backend maintainer
- Conform by the merge request performance guides
- Conform by the style guides
- If you have multiple commits, please combine them into a few logically organized commits by squashing them
What are the relevant issue numbers?
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/34754
EE-Port in: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/5969