[repository] drop usage of no more necessary eschema_eid function since the previous cset, we are guaranteed that repository's entity schema will have their eid attribute properly set, so we don't have anymore to check everytime if some entity schema's .eid attributes is set or not (and retrieve it if not). Related to #10450092

missing-dep-for-interpreter make => make | build-essential | dpkg-dev (usr/*/cubicweb/skeleton/debian/rules.tmpl)