[repository] set .eid on eschema when schema is loaded from the filesystem
enforcing the contract that a repository's schema should have .eid attribute of
entity schema set to the eid of the entity used to serialize them in the db.
Before this cset, this was not true during tests or for some c-c commands where
'quick_start' is set (eg db-restore, i18ncube...).
The change in server __init__ makes this assumption true during instance
creation: the serializing code was actually setting eid on schema object, but a
reference to a previously built schema was given instead of the one for the
latest created repository.
Closes #10450092