[FIX] web: multiedit in a grouped list view: enable fetchBatchedM2O and References

Have grouped list with reference a m2o or a reference field

Select some records, edit them

Before this commit: the names of the reference fields and m2o disappeared

That was because the saveRecords function did not take into account a grouped list

manual forward port of #65999

After this commit: it works as expected

closes odoo/odoo#66043

Signed-off-by: Lucas Perais (lpe) <lpe@odoo.com>