Add basic implementation of CI/CD bridge job

What does this MR do?

This merge requests adds basic implementation of CI/CD bridge job to CE. We will extend this a lot in EE, but basic concept should be implemented in CE.

What are the relevant issue numbers?

See gitlab-ce#52187

Does this MR meet the acceptance criteria?

• Tests added for this feature/bug
• Conforms to the code review guidelines
• Security reports checked/validated by reviewer