editoast: units comments and better variable name

[Wadjetz]

fix #9528

Some improvements for stdcm consist

• Add units comments
• Rename carriage_mass to towed_mass in stdcm consist

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 39.52%. Comparing base (5eeb926) to head (97eeee8).
Report is 14 commits behind head on dev.

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #9552      +/-   ##
============================================
- Coverage     39.52%   39.52%   -0.01%     
  Complexity     2270     2270              
============================================
  Files          1309     1309              
  Lines        100244   100244              
  Branches       3295     3295              
============================================
- Hits          39622    39617       -5     
- Misses        58677    58682       +5     
  Partials       1945     1945              

Flag	Coverage Δ
core	75.06% <ø> (ø)
editoast	73.56% <100.00%> (-0.02%)	⬇️
front	10.10% <ø> (ø)
gateway	2.19% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.74% <ø> (ø)

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[woshilapin]

Thank you for the follow-up.