Decide what builds we will try to reproduce in Jenkins

Switching our Jenkins isobuilders to the vagrant build system was implemented so that we can test the reproducibility of our ISOs in Jenkins. We still did not decide what we will try to reproduce there. Should this be base branches only, or all active branches?

Parent Task: #5630 (closed)

Related issues

Related to #13436 (closed)
Related to #9719

Original created by @bertagaz on 12715 (Redmine)

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