editoast: refactor: renamed many structs for consistency

[hamz2a]

Part of #9724

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.81%. Comparing base (34a4f34) to head (b1dc53e).
Report is 3 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #9810      +/-   ##
==========================================
- Coverage   37.82%   37.81%   -0.01%     
==========================================
  Files         994      994              
  Lines       91126    91126              
  Branches     1176     1176              
==========================================
- Hits        34464    34462       -2     
- Misses      56208    56210       +2     
  Partials      454      454              

Flag	Coverage Δ
editoast	72.99% <100.00%> (-0.01%)	⬇️
front	20.11% <ø> (ø)
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.74% <ø> (ø)

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[leovalais]

LGTM, thanks!