ECMS-6296: Update ECMS unit tests to adapt change from JCR-2307
ECMS-5998: Can't import intranet folder after deleting node "exo:actions"

Fix description:
- Property exo:actions is not mandatory
- Add new upgrade plugin
Merge commit '92f3fdde5be74d09c3eaa5cecc65086d3c6576de' into HEAD