Add support for Multi-Branch Project plugin to Jenkins CI service

This change provides the functionality to retrieve the build state of Jenkins jobs that are configured as Multi-Branch project using the Jenkins Multi-Branch Project Plugin. The checkbox "Multi-project setup enabled" will be replaced by a radio group "Job configuration" that shows the following options: Simple (multi-project unchecked), Gitlab Hook plugin project per branch (mutli-project checked), Multi branch project (the new mode).

Before: before

After: after