feat: 4789 - new "add ingredients" button for nutriscore

[monsieurtanuki]

What

• Added the "add ingredients" button for the computation of nutriscore of new products.

Screenshot

Fixes bug(s)

• Closes: Ask for the list of ingredients for Nutri-score in the "fast track mode"  #4789

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (9d03d4b) 9.92% compared to head (58a51a9) 9.92%.

Files	Patch %	Lines
...th_app/lib/pages/product/add_new_product_page.dart	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #4808      +/-   ##
==========================================
- Coverage     9.92%   9.92%   -0.01%     
==========================================
  Files          310     310              
  Lines        15763   15766       +3     
==========================================
  Hits          1565    1565              
- Misses       14198   14201       +3     

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[g123k]

Perfect, thank you @monsieurtanuki

[monsieurtanuki]

Thank you @g123k for your review!