core: add error when stdcm requests don't end with a stop

[eckter]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 28.48%. Comparing base (e0f4f41) to head (67ede2b).

Files	Patch %	Lines
...n/fr/sncf/osrd/api/api_v2/stdcm/STDCMEndpointV2.kt	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #7919      +/-   ##
============================================
- Coverage     28.49%   28.48%   -0.01%     
  Complexity     2059     2059              
============================================
  Files          1254     1254              
  Lines        154467   154469       +2     
  Branches       3047     3047              
============================================
- Hits          44011    43999      -12     
- Misses       108641   108655      +14     
  Partials       1815     1815              

Flag	Coverage Δ
core	75.00% <33.33%> (-0.01%)	⬇️
editoast	71.64% <ø> (-0.05%)	⬇️
front	9.97% <ø> (ø)
gateway	2.34% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	72.93% <ø> (ø)

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