Allow editors to verify products and mark them as checked

[stephanegigandet]

What

• Add "checked" and "to-be-checked" states.
• Add "last_check_date" facet + "checkers" facet.
• Add checkboxes in product edit form for selected users to mark a product as checked, or re-checked.
• Block 3rd party apps from modifying data or selecting pictures for checked products. (Allow adding pictures without selection).

Part of

• 🧽 Data quality (tracker) #5538

[VaiTon]

So from commit 5354f22 admin can mark products as checked. I guess we should now add the permission system to make some users "editors".

[teolemon]

@stephanegigandet I believe this can be closed

[CharlesNepote]

• https://world.openfoodfacts.org/state/to-be-checked
• https://world.openfoodfacts.org/state/checked
• Add "last_check_date" facet + "checkers" facet
• Block 3rd party apps from modifying data or selecting pictures for checked products. (Allow adding pictures without selection).