LPS-44232 Export models as missing references not only when these are in the global site
LPS-44232 Import all the missing references on the same way
LPS-44232 Align importCompanyStagedModel method name with the new extended functionality
LPS-44232 Apply renaming
LPS-44232 Fill group mapping when importing models
LPS-44232 Use group mappings when validating or importing missing referenes
LPS-44232 Since every layout prototype defines its own group we have to change the PDC group for the contained layouts to simulate the correct environment
LPS-44232 Fix broken tests