tests: update stdcm fuzzer after api change

[eckter]

The endpoint for train IDs in a timetable is now paginated

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.63%. Comparing base (164c697) to head (8e302d4).
Report is 3 commits behind head on dev.

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Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #11042   +/-   ##
=======================================
  Coverage   80.63%   80.63%           
=======================================
  Files        1099     1099           
  Lines      112187   112187           
  Branches      745      745           
=======================================
  Hits        90460    90460           
  Misses      21684    21684           
  Partials       43       43           

Flag	Coverage Δ
editoast	72.18% <ø> (ø)
front	89.94% <ø> (ø)
gateway	2.18% <ø> (ø)
osrdyne	2.53% <ø> (ø)
railjson_generator	87.58% <ø> (ø)
tests	87.90% <ø> (ø)

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[shenriotpro]

Thanks