editoast: provide details when pathfinding failed

[younesschrifi]

Close #8038

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.49%. Comparing base (0f97f32) to head (17485fe).
Report is 82 commits behind head on dev.

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Additional details and impacted files

@@              Coverage Diff              @@
##                dev    #9162       +/-   ##
=============================================
+ Coverage     37.53%   87.49%   +49.95%     
=============================================
  Files          1256       31     -1225     
  Lines        114937     1535   -113402     
  Branches       3271        0     -3271     
=============================================
- Hits          43141     1343    -41798     
+ Misses        69850      192    -69658     
+ Partials       1946        0     -1946     

Flag	Coverage Δ
core	?
editoast	?
front	?
gateway	?
osrdyne	?
railjson_generator	87.49% <ø> (ø)
tests	?

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