Purpose
=======
Check the existence of the relational properties (many2one / many2many)
in batch and prefetch the values in batch as well to reduce the number
of SQL queries.
Technical
=========
The existence is checked in the read method of the properties field,
because we have the entire recordset. Then, the non-existing ids are
remove from the properties values and the cache is updated.
Task-2965523
X-original-commit: dba9b684d29c0041a32a5508284573851b8dd097
Part-of: odoo/odoo#102243
std-odoo
6823aa5f99