Have Jenkins jobs that reproduce ISOs when a branch ticket is Ready for QA

Originally created by @bertagaz on #13436 (Redmine)

Following the discussion on #12715 (closed), we settled on trying to reproduce builds for branches which Redmine ticket is Ready for QA.

Feature Branch: puppet-tails:feature/12633-lower-reproducible-builds-workload;jenkins-jobs:feature/12633-lower-reproducible-builds-workload

Edited May 15, 2020 by bertagaz

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