editoast: optimize batch simulation for stdcm

[younesschrifi]

Second part of https://github.com/osrd-project/osrd-confidential/issues/847

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 82.24299% with 19 lines in your changes missing coverage. Please review.

Project coverage is 81.80%. Comparing base (3985a9e) to head (c405ea8).
Report is 25 commits behind head on dev.

Files with missing lines	Patch %	Lines
editoast/src/views/train_schedule.rs	83.07%	11 Missing ⚠️
editoast/src/views/path/pathfinding.rs	80.95%	8 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10500      +/-   ##
==========================================
+ Coverage   81.78%   81.80%   +0.02%     
==========================================
  Files        1073     1073              
  Lines      106578   106716     +138     
  Branches      731      730       -1     
==========================================
+ Hits        87164    87299     +135     
- Misses      19375    19378       +3     
  Partials       39       39              

Flag	Coverage Δ
editoast	74.27% <82.24%> (+0.05%)	⬆️
front	89.34% <ø> (+<0.01%)	⬆️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	87.05% <ø> (ø)

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[flomonster]

LGTM 🚀