erp5_core: add `getVariationCategoryItemList` to `InventoryListBrain`

Status Job ID Name Coverage
  External
failed ERP5.Master.UnitTest-Titouan.TestRunner.Caterpillar

06:55:34

failed ERP5.Master.UnitTest-Titouan.TestRunner.Caterpillar

06:33:44

failed ERP5.Master.UnitTest-Titouan.TestRunner.Caterpillar

08:23:26

failed ERP5.Master.UnitTest-Titouan.TestRunner.Caterpillar

07:52:38

failed ERP5.Master.UnitTest-Titouan.TestRunner.Caterpillar

15:12:13

passed ERP5.Master.UnitTest-Titouan.TestRunner.Caterpillar

06:31:02

failed ERP5.Master.UnitTest-Titouan.TestRunner.Caterpillar

06:08:19

failed ERP5.Master.UnitTest-Titouan.TestRunner.Caterpillar

08:06:18

failed ERP5.Master.UnitTest-Titouan.TestRunner.Caterpillar

07:59:18

failed ERP5.Master.UnitTest-Titouan.TestRunner.Caterpillar

12:04:03

failed ERP5.Master.UnitTest-Titouan.TestRunner.Caterpillar

03:28:28