[FIX] resource: mixin: copy
[FIX] resource: mixin: copy

When copying a record implementing the resource mixin, the linked
resource should be copied too and not shared across the records.

Fixes #20956
opw-781508

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo