Description of the problem, including code/CLI snippet

This endpoint seems to be not implemented yet - at least, it is not documented:
https://docs.gitlab.com/ee/api/projects.html#list-projects-a-user-has-contributed-to

Expected Behavior

I would love to see this endpoint implemented, as it makes filtering for contributed projects much easier.

Specifications

• python-gitlab version: v5.6.0
• Gitlab server version (or gitlab.com): v17.9