front: simplify rolling stock form type

[Synar]

Simplify type RollingStockParametersValues in the front rolling stock editor and solve the corresponding todo

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.89%. Comparing base (c2135ea) to head (673ab84).
Report is 1 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10699      +/-   ##
==========================================
- Coverage   81.89%   81.89%   -0.01%     
==========================================
  Files        1079     1079              
  Lines      107412   107409       -3     
  Branches      735      734       -1     
==========================================
- Hits        87963    87960       -3     
  Misses      19409    19409              
  Partials       40       40              

Flag	Coverage Δ
editoast	74.29% <ø> (ø)
front	89.40% <100.00%> (-0.01%)	⬇️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	88.14% <ø> (ø)

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[clarani]

Code LGTM, I will test once docker is up again

[clarani]

LGTM ✅