core: stdcm: account for departure time when checking for conflicts

[eckter]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 29.33%. Comparing base (39c3cf8) to head (7c3f28c).
Report is 3 commits behind head on dev.

Files	Patch %	Lines
...n/fr/sncf/osrd/api/api_v2/stdcm/STDCMEndpointV2.kt	0.00%	10 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #7469      +/-   ##
============================================
- Coverage     29.34%   29.33%   -0.01%     
  Complexity     2011     2011              
============================================
  Files          1177     1177              
  Lines        145851   145856       +5     
  Branches       2865     2865              
============================================
- Hits          42800    42790      -10     
- Misses       101367   101382      +15     
  Partials       1684     1684              

Flag	Coverage Δ
core	75.09% <0.00%> (-0.03%)	⬇️
editoast	72.41% <ø> (-0.04%)	⬇️
front	9.78% <ø> (ø)
gateway	2.41% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	83.96% <ø> (ø)

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