Support settings Quiet Period in multibranch pipeline builds

Currently only normal pipelines, and non-pipeline job types support setting the quiet period within build triggers. Having this functionality is even more important for multi-branch pipelines because of the way reindexing after a merge occurs.

If I want to merge a large number of branches into master, than for each merge, jenkins will trigger a rebuild of all open pull-requests. It would be great if we could merge everything quickly, and only trigger a single rebuild of each pull-request we have open.