feat: use discount info endpoint for streak discount information

[NawfalAhmed]

Description

This PR aims to introduce an override for streak discount information based on an env variable DISCOUNT_CODE_INFO_URL

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 4 lines in your changes missing coverage. Please review.

Project coverage is 90.28%. Comparing base (b050535) to head (4f60da9).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...ared/streak-celebration/StreakCelebrationModal.jsx	85.71%	3 Missing ⚠️
src/index.jsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1763      +/-   ##
==========================================
- Coverage   90.46%   90.28%   -0.19%     
==========================================
  Files         344      344              
  Lines        5812     5824      +12     
  Branches     1360     1403      +43     
==========================================
  Hits         5258     5258              
- Misses        537      549      +12     
  Partials       17       17              

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