editoast: add roles check to views::v2::path::pathfinding

[hamz2a]

Part of #8446

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 37.03%. Comparing base (ab7706e) to head (ea2a91c).
Report is 34 commits behind head on dev.

Files	Patch %	Lines
editoast/src/views/v2/path/pathfinding.rs	0.00%	8 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #8449      +/-   ##
============================================
- Coverage     37.04%   37.03%   -0.01%     
  Complexity     2165     2165              
============================================
  Files          1267     1267              
  Lines        117208   117216       +8     
  Branches       3139     3139              
============================================
- Hits          43414    43413       -1     
- Misses        71952    71961       +9     
  Partials       1842     1842              

Flag	Coverage Δ
core	74.94% <ø> (ø)
editoast	66.39% <0.00%> (-0.03%)	⬇️
front	15.78% <ø> (ø)
gateway	2.20% <ø> (ø)
osrdyne	2.71% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	73.00% <ø> (ø)

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