Take into account obsolete collection

[alexgarel]

On product opener side We now move obsolete products to their own collection (see openfoodfacts/openfoodfacts-server#8277)

So on robotoff side, when we look for a product in mongodb we should check for both collection: the regular collection (products) and the obsolete one (products_obsolete).

Part of

• 🗄 Obsolete products (tracker) openfoodfacts-server#8814

[raphael0202]

We also check every night that insights are still valid using product dump, it's sure that the obsolete products are still in the JSONL product dump?

[alexgarel]

It's sure that the obsolete products are still in the JSONL product dump?

No they are not (yet).

That said @stephanegigandet thinks obsolete products are less than 5 000 so it's not that a priority.