editoast: add utoipa annotation for infra/{id}/voltages

[hamz2a]

Part of #4580

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 82.75862% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 29.12%. Comparing base (113dbd9) to head (cb61aa0).
Report is 1 commits behind head on dev.

Files	Patch %	Lines
front/src/common/api/osrdEditoastApi.ts	81.25%	3 Missing ⚠️
.../rangeEdition/components/RangeEditionLeftPanel.tsx	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff            @@
##                dev    #7344   +/-   ##
=========================================
  Coverage     29.11%   29.12%           
  Complexity     2020     2020           
=========================================
  Files          1138     1138           
  Lines        139734   139740    +6     
  Branches       2757     2757           
=========================================
+ Hits          40689    40695    +6     
  Misses        97436    97436           
  Partials       1609     1609           

Flag	Coverage Δ
core	76.76% <ø> (ø)
editoast	72.06% <100.00%> (+<0.01%)	⬆️
front	9.34% <72.22%> (-0.01%)	⬇️
gateway	2.43% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	83.96% <ø> (ø)

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[SharglutDev]

Lgtm