(7.2.z) HHH-13611 Restore EntityMetamodel constructor to take SessionFactoryImplementor argument instead of PersisterCreationContext.

https://hibernate.atlassian.net/browse/HHH-13611

This would affect a custom EntityPersister that constructs its own EntityMetamodel} instance.

Most applications with a custom EntityPersister would extend an existing implementation (e.g., AbstractEntityPersister, SingleTableEntityPersister), so it is unlikely to affect them.