editoast: add roles to scenario and study

[Wadjetz]

No description provided.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 76.22951% with 29 lines in your changes missing coverage. Please review.

Project coverage is 36.88%. Comparing base (80973c5) to head (7d7de3f).
Report is 3 commits behind head on dev.

Files with missing lines	Patch %	Lines
editoast/src/views/study.rs	76.74%	10 Missing ⚠️
editoast/src/views/v2/scenario.rs	77.77%	10 Missing ⚠️
editoast/src/views/projects.rs	75.75%	8 Missing ⚠️
editoast/editoast_authz/src/builtin_role.rs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #8401      +/-   ##
============================================
+ Coverage     36.84%   36.88%   +0.03%     
  Complexity     2175     2175              
============================================
  Files          1279     1279              
  Lines        118794   118910     +116     
  Branches       3188     3188              
============================================
+ Hits          43774    43859      +85     
- Misses        73135    73166      +31     
  Partials       1885     1885              

Flag	Coverage Δ
core	74.87% <ø> (ø)
editoast	66.12% <76.22%> (+0.02%)	⬆️
front	15.84% <ø> (ø)
gateway	2.20% <ø> (ø)
osrdyne	2.71% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	72.93% <ø> (ø)

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[hamz2a]

LGTM.