Disable edition of protected data sent by producers in the web product edit form, with explanations

[stephanegigandet]

Some data imported from producers through the producers platform cannot be edited by users (unless they are moderators). We should visually disable the edition of those fields in the product edit form, with an explanation, and a mechanism to contact us in case the user believes something protected is innaccurate.

See also:

• Verify coverage of producer data protection #6816

• Better API support for protected products #2012

• We have no warning mechanism in Smoothie in case a product is protected (and the edit possibly refused) #6721

• Note: when fix: refactor protection of data imported from producers #8274 is merged, edits of protected fields through the web form will be silently ignored, but we need to warn users beforehand.

[github-actions]

This issue has been open 90 days with no activity. Can you give it a little love by linking it to a parent issue, adding relevant labels and projets, creating a mockup if applicable, adding code pointers from https://github.com/openfoodfacts/openfoodfacts-server/blob/main/.github/labeler.yml, giving it a priority, editing the original issue to have a more comprehensive description… Thank you very much for your contribution to 🍊 Open Food Facts