Add an actions field in the product read API to return a list of actions (taking a picture, completing a field)

[stephanegigandet]

For the app, we need a new field to get back a list of actions that users can take.

Those actions should be the same as the ones that are already included in some knowledge panels when we are missing data to compute the panel.

Part of

• 🤳🥫 Support our mobile app (Tracker) #8919