Remove Jenkins disabled check
What does this MR do?
After moving Jenkins to core !37797 (merged) (relevant part is ee/app/models/ee/project.rb
), we don't need to extra check if the Jenkins service is disabled. This is a leftover from that work.
In the case we want to disable the integration, we also have to review other parts of the codebase.
Related to #246756 (closed)
Edited by Arturo Herrero