core: stdcm: fix priority between stop and departure delay

[eckter]

Fix #9508

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 39.51%. Comparing base (5eeb926) to head (17d418b).
Report is 13 commits behind head on dev.

Files with missing lines	Patch %	Lines
...in/fr/sncf/osrd/stdcm/graph/STDCMPostProcessing.kt	83.33%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #9514      +/-   ##
============================================
- Coverage     39.52%   39.51%   -0.01%     
- Complexity     2270     2271       +1     
============================================
  Files          1309     1309              
  Lines        100244   100257      +13     
  Branches       3295     3296       +1     
============================================
- Hits          39622    39621       -1     
- Misses        58677    58690      +13     
- Partials       1945     1946       +1     

Flag	Coverage Δ
core	75.06% <94.73%> (-0.01%)	⬇️
editoast	73.54% <ø> (-0.04%)	⬇️
front	10.10% <ø> (ø)
gateway	2.19% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.74% <ø> (ø)

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[Erashin]

Unit tests looking good as well.