editoast: add roles check to views::layers

[hamz2a]

Part of #8446

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 38.09524% with 13 lines in your changes missing coverage. Please review.

Project coverage is 36.97%. Comparing base (338d89d) to head (62f84ae).
Report is 2 commits behind head on dev.

Files	Patch %	Lines
editoast/src/views/layers.rs	40.00%	12 Missing ⚠️
editoast/editoast_authz/src/builtin_role.rs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #8479      +/-   ##
============================================
- Coverage     36.98%   36.97%   -0.02%     
  Complexity     2168     2168              
============================================
  Files          1271     1271              
  Lines        118034   118059      +25     
  Branches       3174     3174              
============================================
- Hits          43656    43650       -6     
- Misses        72503    72534      +31     
  Partials       1875     1875              

Flag	Coverage Δ
core	74.90% <ø> (ø)
editoast	66.22% <38.09%> (-0.08%)	⬇️
front	15.95% <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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