Change train schedule endpoint batch post

[flomonster]

Doc update: OpenRailAssociation/osrd-website#193

[leovalais]

LGTM (1st pass)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 42.73504% with 67 lines in your changes are missing coverage. Please review.

Project coverage is 29.11%. Comparing base (85349f4) to head (f0fd1e2).

Files	Patch %	Lines
...tTrainSchedule/ImportTrainScheduleTrainsListV2.tsx	0.00%	46 Missing ⚠️
...rationalStudies/views/v2/ImportTrainScheduleV2.tsx	0.00%	8 Missing ⚠️
...mportTrainSchedule/ImportTrainScheduleConfigV2.tsx	0.00%	7 Missing ⚠️
front/src/common/api/osrdEditoastApi.ts	81.81%	4 Missing ⚠️
editoast/src/views/v2/timetable.rs	96.87%	1 Missing ⚠️
...ortTrainSchedule/generateTrainSchedulesPayloads.ts	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff            @@
##                dev    #7337   +/-   ##
=========================================
  Coverage     29.10%   29.11%           
  Complexity     2016     2016           
=========================================
  Files          1141     1141           
  Lines        139880   139903   +23     
  Branches       2769     2769           
=========================================
+ Hits          40709    40729   +20     
- Misses        97555    97558    +3     
  Partials       1616     1616           

Flag	Coverage Δ
core	76.32% <ø> (ø)
editoast	71.95% <96.96%> (+0.03%)	⬆️
front	9.35% <21.42%> (+<0.01%)	⬆️
gateway	2.43% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	83.96% <ø> (ø)

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[younesschrifi]

LGTM :)