[WIP][DD-833] finalized MappingAttributePathInstanceServiceTest
[WIP][DD-833] re-named default create methods in service test utils
[WIP][DD-833] re-named default create-and-compare and update-and-compare methods in service test utils
[WIP][DD-833] finalized FunctionServiceTest re-factoring
[WIP][DD-833] introduced generic test for testing the persistence method (create + update) on a simple object (entity)
[WIP][DD-833] finalized ComponentServiceTest re-factoring
[WIP][DD-833] finalized TransformationServiceTest re-factoring
[WIP][DD-833] finalized MappingServiceTest re-factoring