editoast: add roles check to views::timetable

[hamz2a]

Part of #8446

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 60.41667% with 19 lines in your changes missing coverage. Please review.

Project coverage is 36.83%. Comparing base (7a8685f) to head (f0e6625).
Report is 1 commits behind head on dev.

Files	Patch %	Lines
editoast/src/views/v2/timetable.rs	63.04%	17 Missing ⚠️
editoast/editoast_authz/src/builtin_role.rs	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #8445      +/-   ##
============================================
- Coverage     36.83%   36.83%   -0.01%     
  Complexity     2169     2169              
============================================
  Files          1280     1280              
  Lines        118631   118678      +47     
  Branches       3184     3184              
============================================
+ Hits          43694    43710      +16     
- Misses        73054    73085      +31     
  Partials       1883     1883              

Flag	Coverage Δ
core	74.86% <ø> (ø)
editoast	66.12% <60.41%> (-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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