LPS-41340 Implement delete methods for asset category and asset vocabulary staged model data handlers
LPS-41340 Implement referencing between categories/parent categories/vocabulary
LPS-41340 No logic changes - copy related code from PortletExporter and PortletImporter
LPS-41340 Apply changes to SMDHs
LPS-41340 Minor SF
LPS-41340 No logic changes - Removing recently copied methods from PortletExporter and PortletImporter
LPS-41340 No logic changes - move method to ExportImportClassedModelUtil and apply refactor
LPS-41340 No logic changes - Copy and deprecate method from PortletDataContext to BaseStagedModelDataHandler
LPS-41340 Apply changes to BaseStagedModelDataHandler - entity associated categories should be exported and imported
LPS-41340 Apply changes to Layout/PortletExporter and PortletImporter - exporting and importing of asset categories will be handled by new SMDHs
LPS-41340 Update test for the new infrastucture - not much change since we were already testing asset entries and categories, just needed a small alignment