front: remove sentry

[woshilapin]

follow-up on #7241

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.49%. Comparing base (e97a8a1) to head (a01a37b).
Report is 13 commits behind head on dev.

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Additional details and impacted files

@@              Coverage Diff              @@
##                dev    #7574       +/-   ##
=============================================
+ Coverage     29.00%   87.49%   +58.48%     
=============================================
  Files          1207       31     -1176     
  Lines        147365     1535   -145830     
  Branches       2909        0     -2909     
=============================================
- Hits          42747     1343    -41404     
+ Misses       102903      192   -102711     
+ Partials       1715        0     -1715     

Flag	Coverage Δ
core	?
editoast	?
front	?
gateway	?
railjson_generator	87.49% <ø> (ø)
tests	?

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[emersion]

Seems like there are a few remaining mentions of Sentry in .env.example and .env.local.defaults!

[SharglutDev]

Lgtm, the app seems to be still working :)