editoast: add roles check to views::train_schedule

[hamz2a]

Part of #8446

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 65.07937% with 22 lines in your changes missing coverage. Please review.

Project coverage is 36.84%. Comparing base (b58bc6b) to head (5d54097).
Report is 1 commits behind head on dev.

Files	Patch %	Lines
editoast/src/views/v2/train_schedule.rs	66.12%	21 Missing ⚠️
editoast/src/views/v2/train_schedule/projection.rs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff            @@
##                dev    #8436   +/-   ##
=========================================
  Coverage     36.83%   36.84%           
  Complexity     2169     2169           
=========================================
  Files          1280     1280           
  Lines        118678   118739   +61     
  Branches       3184     3184           
=========================================
+ Hits          43720    43747   +27     
- Misses        73075    73109   +34     
  Partials       1883     1883           

Flag	Coverage Δ
core	74.86% <ø> (ø)
editoast	66.10% <65.07%> (-0.05%)	⬇️
front	15.84% <ø> (ø)
gateway	2.20% <ø> (ø)
osrdyne	2.71% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	72.91% <ø> (ø)

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[leovalais]

Regarding my previous comments, you need both the roles for infra and timetable. Likewise for projection.