tests: ts2: adapt fuzzer

[eckter]

1. Add a new version of the fuzzer script, calling only timetable v2 versions of the endpoints
2. Add a new version of the script loading the fuzzer files to reproduce the test cases

The old version should be deleted at the same time as the old endpoints.

One difference compared to the v1 is that we don't ignore any error, we don't ignore when the path doesn't exist or when the margins are impossible. It's not necessarily a problem (we don't risk ignoring an actual issue), but we need to filter through the results manually. And we can't run the script directly in the test suite anymore.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 37.04819% with 209 lines in your changes are missing coverage. Please review.

Project coverage is 18.64%. Comparing base (da73cf0) to head (d0ac9a5).

Files	Patch %	Lines
tests/fuzzer/fuzzer_v2.py	28.62%	192 Missing ⚠️
tests/tests/test_regressions_v2.py	74.19%	16 Missing ⚠️
tests/fuzzer/fuzzer.py	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@              Coverage Diff              @@
##                dev    #7324       +/-   ##
=============================================
- Coverage     29.34%   18.64%   -10.71%     
  Complexity     2012     2012               
=============================================
  Files          1198      928      -270     
  Lines        147045   118052    -28993     
  Branches       2889     2889               
=============================================
- Hits          43156    22009    -21147     
+ Misses       102188    94342     -7846     
  Partials       1701     1701               

Flag	Coverage Δ
core	75.08% <ø> (ø)
editoast	?
front	9.76% <ø> (ø)
gateway	2.41% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	71.78% <37.04%> (-12.46%)	⬇️

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