Warn visitors when the product page they're viewing is older than 18 months

[TaciteOFF]

What

• Ingredients and nutrition facts change very often. Products that don't change within 2 years are very rare.
• By warning visitors that ingredients and/or nutrition facts haven't been updated for 18 months or more, we help them.

NB: For beverages, we can extend the period from 18 months to 24 months or more, we can also hide it for non-processed vegetables or water.

Part of

• 🧽 Data quality (tracker) #5538

[bcatelin]

When such a product is detected, from the apps, we shall see a button to add to our 'products you have added that need to be completed'.
basically a way to add it to my todo list, from the app.