[JENKINS-891] More elegant way of doing job renames #13839

Currently the BuildTrigger is the only Publisher that gets called when a job is
renamed.

The snippet of code that seems to do that is (Job.java line 340):
                // update BuildTrigger of other projects that point to this object.
                // can't we generalize this?
                for( Project p : parent.getProjects() ) {
                    BuildTrigger t = (BuildTrigger)
p.getPublishers().get(BuildTrigger.DESCRIPTOR);
                    if(t!=null) 
{
                        if(t.onJobRenamed(oldName,newName))
                            p.save();
                    }
                }

How about creating a notification interface and alerting all plugins
implementing this interface when a job is renamed? This will allow people
writing plugins to also make use of this nice functionality.