[IMP] repair: improve constraint error message

* Private method
* Clearer and more complete error message, specifying all erroneous records

Task Id: 2328664
COM PR: https://github.com/odoo/odoo/pull/55525
ENT PR: https://github.com/odoo/enterprise/pull/12250

addons/repair/models/repair.py

@@ -652,9 +652,14 @@ class RepairLine(models.Model):
         help='The status of a repair line is set automatically to the one of the linked repair order.')
 
     @api.constrains('lot_id', 'product_id')
-    def constrain_lot_id(self):
-        for line in self.filtered(lambda x: x.product_id.tracking != 'none' and not x.lot_id):
-            raise ValidationError(_("Serial number is required for operation line with product '%s'") % (line.product_id.name))
+    def _check_product_tracking(self):
+        invalid_lines = self.filtered(lambda x: x.product_id.tracking != 'none' and not x.lot_id)
+        if invalid_lines:
+            products = invalid_lines.product_id
+            raise ValidationError(_(
+                "Serial number is required for operation lines with products: %s",
+                ", ".join(products.mapped('name')),
+            ))
 
     @api.depends('price_unit', 'repair_id', 'product_uom_qty', 'product_id', 'repair_id.invoice_method')
     def _compute_price_subtotal(self):