[FIX] base: fix batched version of get_metadata

- The batch version of get_metadata won't work correctly for the xmlid
returns due to the limit=1 (cause by
718b0f8b ). Fix the
previous issue by reversing the order and without limit.
- The read should be read with the correct user.

closes odoo/odoo#78770

Signed-off-by: Rémy Voet <ryv@odoo.com>