TPS-701 [5.5.1]"Unkown" error occurs during data model validation(TMDM-7572)

TMDM-7572: "'Unkown' error occurs during data model validation"
- Fix field not found issue when type has multiple inheritance in parsed data model.
(cherry picked from commit 56e96968063722e5f632bff5930996fb8de3bff0)

TMDM-7583: "DataContainer deploy failed with Customer XSD"

Implements new behavior in case of detected multiple entity inheritance.
(cherry picked from commit 62c5d601fbc0f57ef391fb6d635fd8700a336280)