front: stdcm: persist user-entered date and time in the interface

[SarahBellaha]

Closes STDCM: Persist user-entered times & dates after a pathstep changed

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 24.61538% with 49 lines in your changes missing coverage. Please review.

Project coverage is 37.13%. Comparing base (68e0513) to head (9b814b4).

Files with missing lines	Patch %	Lines
...plications/stdcmV2/components/StdcmDestination.tsx	0.00%	21 Missing and 1 partial ⚠️
...rc/applications/stdcmV2/components/StdcmOrigin.tsx	0.00%	19 Missing and 1 partial ⚠️
...pplications/stdcmV2/components/StdcmOpSchedule.tsx	0.00%	4 Missing ⚠️
...ront/src/reducers/osrdconf/osrdConfCommon/index.ts	50.00%	0 Missing and 2 partials ⚠️
front/src/utils/date.ts	93.33%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #8942      +/-   ##
============================================
- Coverage     37.13%   37.13%   -0.01%     
  Complexity     2211     2211              
============================================
  Files          1260     1260              
  Lines        115076   115120      +44     
  Branches       3230     3234       +4     
============================================
+ Hits          42736    42746      +10     
- Misses        70407    70437      +30     
- Partials       1933     1937       +4     

Flag	Coverage Δ
core	74.67% <ø> (ø)
editoast	72.55% <ø> (-0.02%)	⬇️
front	15.21% <24.61%> (+<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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[Yohh]

not really an issue, just a suggestion: we could create an explicit type instead of repeating those parameters