feat: Improve annotation process for nutrition_extraction insight

[raphael0202]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 82.75862% with 10 lines in your changes missing coverage. Please review.

Project coverage is 55.81%. Comparing base (cc23950) to head (381d914).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
robotoff/insights/annotate.py	72.97%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1501      +/-   ##
==========================================
+ Coverage   55.54%   55.81%   +0.26%     
==========================================
  Files          85       86       +1     
  Lines        8740     8797      +57     
==========================================
+ Hits         4855     4910      +55     
- Misses       3885     3887       +2     

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