feat: The user's cookie is now stored and passed to the API

[g123k]

Hi everyone!

We can now get the user's cookie via the API.
It allows us to send it with the getProduct() method and thus have different KP depending on the connected user.

The idea is to give access to the Nutri-Score v2.
For now, there are only the EN images in cache.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 11.11111% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 9.51%. Comparing base (4d9c7fc) to head (db6c300).
Report is 77 commits behind head on develop.

Files	Patch %	Lines
..._app/lib/data_models/user_management_provider.dart	12.50%	7 Missing ⚠️
...kages/smooth_app/lib/data_models/login_result.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5170      +/-   ##
==========================================
- Coverage     9.54%   9.51%   -0.04%     
==========================================
  Files          325     327       +2     
  Lines        16411   16579     +168     
==========================================
+ Hits          1567    1578      +11     
- Misses       14844   15001     +157     

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[teolemon]

👍 good

[g123k]

Thanks.
I forgot to mention it, but you have to log in again to get the cookie.