backport stable

[migration] when some inlined relation definition is added to an entity type which has some specialized types, it should be propagated to those types else they may miss the necessary table column to store the relation

[migration] dont crash if a group doesn't exists (it may not exists yet)

[migration] fix rename_entity_type bug: not putting eids of relation deleted using sql query may cause later error on commit, complaining on missing relation on an entity which has been actually deleted