Issue related to order.items.variant.product.profile_id

[imumesh18]

So in case of the child order the order.items.variant.product.profile_id is not populated which causes the orders to go into Partilly fulfilled state if there are more than 2 items in the order. Hence cause a state where the orders are not getting fulfilled properly. I know the fix needs to be made in [order-placed-handler.ts](https://github.com/mercurjs/mercur-api-starter/blob/main/src/subscribers/order-placed-handler.ts) but I am not able to figure it out what needs to be fixed. If you can help me that would be great with the fix.