front: imported trains are loaded automatically without refresh

[clarani]

closes #8679

Once the trains are imported, the new trainSchedules need to be refetched manually with the upsertTrainSchedules function

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 18 lines in your changes missing coverage. Please review.

Project coverage is 37.12%. Comparing base (be28062) to head (0d1770e).
Report is 6 commits behind head on dev.

Files with missing lines	Patch %	Lines
...s/operationalStudies/views/ImportTrainSchedule.tsx	0.00%	9 Missing ⚠️
...ortTrainSchedule/ImportTrainScheduleTrainsList.tsx	0.00%	5 Missing ⚠️
...nalStudies/components/Scenario/ScenarioContent.tsx	0.00%	4 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #8886      +/-   ##
============================================
- Coverage     37.13%   37.12%   -0.01%     
  Complexity     2211     2211              
============================================
  Files          1260     1260              
  Lines        114956   114970      +14     
  Branches       3223     3223              
============================================
- Hits          42689    42688       -1     
- Misses        70335    70350      +15     
  Partials       1932     1932              

Flag	Coverage Δ
core	74.79% <ø> (ø)
editoast	72.58% <ø> (-0.01%)	⬇️
front	15.20% <0.00%> (-0.01%)	⬇️
gateway	2.20% <ø> (ø)
osrdyne	2.60% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.46% <ø> (ø)

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[SharglutDev]

Lgtm and tested, good job !

[Math-R]

nice job :) lgtm