front: fix train edition setup

[clarani]

closes #9805

Since recently, when opening the view to edit a train, a pathfinding request is automatically launched. But it is launched before the store update, which creates the bug: the pathfinding is launched with the pathsteps stored in the store (and not the ones of the train we want to edit) and once the pathfinding request is finished, we update the store with the result of the request (and erase the path steps of the currently selected train).

To fix this, we can directly update the store before opening the ManageTrainSchedule view.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 82.22222% with 16 lines in your changes missing coverage. Please review.

Project coverage is 37.85%. Comparing base (e32c89b) to head (e18a810).
Report is 35 commits behind head on dev.

Files with missing lines	Patch %	Lines
...alStudies/hooks/useSetupItineraryForTrainUpdate.ts	14.28%	6 Missing ⚠️
...ules/trainschedule/helpers/computeBasePathSteps.ts	88.46%	6 Missing ⚠️
...hedule/components/Timetable/TimetableTrainCard.tsx	0.00%	3 Missing ⚠️
...nalStudies/helpers/formatTrainScheduleSummaries.ts	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #9826      +/-   ##
==========================================
+ Coverage   37.82%   37.85%   +0.03%     
==========================================
  Files         994      994              
  Lines       91126    91167      +41     
  Branches     1176     1191      +15     
==========================================
+ Hits        34468    34514      +46     
+ Misses      56204    56199       -5     
  Partials      454      454              

Flag	Coverage Δ
editoast	72.97% <ø> (-0.05%)	⬇️
front	20.20% <82.22%> (+0.09%)	⬆️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.74% <ø> (ø)

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[Caracol3]

lgtm (tested)

[kmer2016]

LGTM !