editoast: improve naming of extracted variables in several handlers

[leovalais]

refs #8178

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 44.44444% with 30 lines in your changes missing coverage. Please review.

Project coverage is 36.84%. Comparing base (7137459) to head (cdc627a).
Report is 28 commits behind head on dev.

Files with missing lines	Patch %	Lines
editoast/src/views/v2/timetable/stdcm.rs	0.00%	24 Missing ⚠️
editoast/src/views/v2/train_schedule/projection.rs	0.00%	6 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #8674      +/-   ##
============================================
- Coverage     36.87%   36.84%   -0.04%     
  Complexity     2177     2177              
============================================
  Files          1255     1255              
  Lines        113689   113788      +99     
  Branches       3203     3203              
============================================
- Hits          41928    41926       -2     
- Misses        69866    69967     +101     
  Partials       1895     1895              

Flag	Coverage Δ
core	74.79% <ø> (ø)
editoast	71.69% <44.44%> (-0.07%)	⬇️
front	14.94% <ø> (-0.02%)	⬇️
gateway	2.20% <ø> (ø)
osrdyne	2.71% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.45% <ø> (ø)

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[hamz2a]

LGTM, thanks !