Revert "Remove p.a.contenttypes from the auto-checkout. The RichText behavior broke a lot of tests and amleczko did not revert the commit so far. To make things worse 10 commits came after that, so now there is no way to fix/revert this easily. Having the 5.0 build broken currently prevents us to merge all other work that has been done during the cathedral sprint."

This reverts commit 6b787f8ea21e1406359b16d7fc41ba67ea8dbf2b.