[cwconfig] load appobjects subpackages recursively
This is a regression appeared in 3.25.0. Appobjects (entities, views etc)
subpackages should be loaded recursively, this is the historical behavior,
relevant code is in logilab.common.registry._toload_info().
To keep historical behavior schema subpackages should not be loaded, relevant
code is in yams.reader.get_schema_files().
We may want to have a consistent behavior later on...
Closes #17073706.
