feat: Custom domain + environment support for the TagLine

[g123k]

Hi everyone!

The TagLine fetcher now supports custom domains + test/prod environments.
When one of the two is updated, the tagline is forced to be resynced with the new URL.

• In the case where the JSON is invalid, an error is not sent to Sentry

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 59 lines in your changes missing coverage. Please review.

Project coverage is 7.44%. Comparing base (4d9c7fc) to head (41091de).
Report is 183 commits behind head on develop.

Files	Patch %	Lines
..._app/lib/data_models/tagline/tagline_provider.dart	0.00%	26 Missing ⚠️
packages/smooth_app/lib/pages/scan/scan_page.dart	0.00%	24 Missing ⚠️
packages/smooth_app/lib/main.dart	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5364      +/-   ##
==========================================
- Coverage     9.54%   7.44%   -2.11%     
==========================================
  Files          325     380      +55     
  Lines        16411   19454    +3043     
==========================================
- Hits          1567    1448     -119     
- Misses       14844   18006    +3162     

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[teolemon]

thanks @g123k 👍