LPS-47328 No logic changes - Copy LiferayBase to RepositoryModelUtil
LPS-47328 extract util logic out of LiferayBase

LiferayBase is used as a base class only to inherit util methods. Move that
logic into a util class and make callers invoke the new method.
LPS-47328 remove references to LiferayBase

With the util methods out of LiferayBase, there is no need to inherit
from it.
LPS-47328 deprecate unused methods
LPS-47328 add comment
LPS-47328 Point to the right place