moodle_mod-hvp

* Check backup consistency before importing workflow

* Fix PHPDocs

* Use existing category in backup_and_restore test

* lifecycletrigger_categories: A bit of general refactoring

* lifecycletrigger_categories: Don't fail if category doesn't exist

* Add possibility to force import of errorneous backup

* Use $force = false as default in restore_workflow:execute

* Display only unique errors when Workflows causes multiple errors

---------

Co-authored-by: Justus Dieckmann <justusdieckmann@wwu.de>
Co-authored-by: NinaHerrmann <nina.herrmann@uni-muenster.de>