fron: lmr consist prefill mass length max speed

[Wadjetz]

part of #9712

Prefill the consist values based on the rolling stock and towed rolling stock selection.
Do not update the value if the user has manually changed it.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 8.82353% with 31 lines in your changes missing coverage. Please review.

Project coverage is 38.19%. Comparing base (02ccfc8) to head (b207d7c).
Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
...nt/src/applications/stdcm/hooks/useStdcmConsist.ts	0.00%	24 Missing and 1 partial ⚠️
...ations/stdcm/components/StdcmForm/StdcmConsist.tsx	0.00%	3 Missing ⚠️
front/src/utils/physics.ts	60.00%	2 Missing ⚠️
...lications/stdcm/hooks/useStdcmTowedRollingStock.ts	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #9910      +/-   ##
==========================================
- Coverage   38.21%   38.19%   -0.03%     
==========================================
  Files         992      992              
  Lines       92158    92191      +33     
  Branches     1186     1186              
==========================================
- Hits        35221    35211      -10     
- Misses      56486    56529      +43     
  Partials      451      451              

Flag	Coverage Δ
editoast	73.35% <ø> (-0.05%)	⬇️
front	20.18% <8.82%> (-0.01%)	⬇️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	87.00% <ø> (ø)

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[SharglutDev]

Thank you for the PR ! Almost good, left some comments

[SharglutDev]

Lgtm and tested, good job !