editoast: refactor train schedule v2 tests

[Wadjetz]

part of #6980

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.87097% with 5 lines in your changes missing coverage. Please review.

Project coverage is 28.61%. Comparing base (38f002e) to head (285b542).

Files	Patch %	Lines
editoast/src/views/v2/timetable/stdcm.rs	0.00%	2 Missing ⚠️
editoast/src/views/v2/path/pathfinding.rs	0.00%	1 Missing ⚠️
editoast/src/views/v2/path/properties.rs	0.00%	1 Missing ⚠️
editoast/src/views/v2/timetable.rs	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #7748      +/-   ##
============================================
- Coverage     28.62%   28.61%   -0.01%     
  Complexity     2038     2038              
============================================
  Files          1244     1244              
  Lines        153664   153684      +20     
  Branches       3012     3012              
============================================
- Hits          43985    43978       -7     
- Misses       107888   107915      +27     
  Partials       1791     1791              

Flag	Coverage Δ
core	75.05% <ø> (ø)
editoast	72.08% <83.87%> (-0.08%)	⬇️
front	9.90% <ø> (ø)
gateway	2.41% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	72.93% <ø> (ø)

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[woshilapin]

Looks good. Thank you 🎉