feat: #3065 - using Robotoff question imageUrl if available

[monsieurtanuki]

Impacted files:

• Podfile.lock (app): wtf
• Podfile.lock (smooth_app): wtf
• product_image_carousel.dart: added optional imageUrl that displays it instead of the standard all pictures
• question_card.dart: added Robotoff question imageUrl if available

What

• In Robotoff questions, there is an optional imageUrl field that we didn't use at all in Smoothie.
• When the field is populated, it is the best field that could help the user answer the question, so it should be displayed with the higher priority (instead of being ignored).
• This PR displays the standard carousel of images when the question imageUrl field is not populated (same as before), or only the question imageUrl field if populated. If needed by the user, all pictures are still available if you click on the single picture.

Open questions:

• Should we display the question imageUrl AND the rest of the images - can be problematic when the imageUrl is the front image, like stuttering (would need deduplicating)
• Should we display a bigger image instead of the carousel?
• Are the question imageUrl always populated?

Screenshot

before	after

Fixes bug(s)

• Closes: On Robotoff question, display the image that triggered insight creation #3065

[codecov-commenter]

Codecov Report

Merging #3178 (c267beb) into develop (3b2a12f) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           develop   #3178      +/-   ##
==========================================
- Coverage     6.18%   6.17%   -0.01%     
==========================================
  Files          252     252              
  Lines        12491   12496       +5     
==========================================
  Hits           772     772              
- Misses       11719   11724       +5     

Impacted Files	Coverage Δ
...ib/cards/product_cards/product_image_carousel.dart	0.00% <0.00%> (ø)
...ooth_app/lib/pages/hunger_games/question_card.dart	0.00% <0.00%> (ø)

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[monsieurtanuki]

Thank you @M123-dev for your review!
Not 100% convinced by the visual aspect though... Well, that would be a new issue.