feat: 5099 - new dev mode item to refresh all the products from the server

[monsieurtanuki]

What

• New item in dev mode: "Refresh all products from server (cf. Nutriscore v2)".
• With a click, we refresh all the local product database from the server using background tasks.
• Here we reuse the "change the app language" mechanism just after resetting all the local product languages.

Screenshot

Fixes bug(s)

• Closes: Update of all the local products from the server #5099

Impacted files

• dao_product.dart: new method clearAllLanguages
• pubspec.lock: wtf
• user_preferences_dev_mode.dart: added a "Refresh all products from server (cf. Nutriscore v2)" item

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 9.52%. Comparing base (4d9c7fc) to head (850a0b1).
Report is 53 commits behind head on develop.

Files	Patch %	Lines
...b/pages/preferences/user_preferences_dev_mode.dart	0.00%	7 Missing ⚠️
packages/smooth_app/lib/database/dao_product.dart	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5100      +/-   ##
==========================================
- Coverage     9.54%   9.52%   -0.02%     
==========================================
  Files          325     327       +2     
  Lines        16411   16538     +127     
==========================================
+ Hits          1567    1576       +9     
- Misses       14844   14962     +118     

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[monsieurtanuki]

Thank you @teolemon for your review!