Required argument to `get_cells_by_ids_for_user` is not passed

[mbabadi]

model_name is a required parameter of cell_operations_service.get_cells_by_ids_for_user. In cell_operations_router.py, this parameter is not passed:

cellarium-cloud/src/casp/services/api/routers/cell_operations_router.py

Lines 132 to 133 in c44d694

	return cell_operations_service.get_cells_by_ids_for_user(
	user=user,