core: change interface for pathfinding errors on rolling-stock constraints

[bougue-pe]

Full WIP

TODO: fix test

Fix: #7719

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 72.67081% with 44 lines in your changes missing coverage. Please review.

Project coverage is 27.21%. Comparing base (bc3c002) to head (f629528).

Files	Patch %	Lines
.../api_v2/pathfinding/PathfindingBlocksEndpointV2.kt	83.49%	8 Missing and 9 partials :warning:
...pi/api_v2/pathfinding/PathfindingPostProcessing.kt	38.46%	10 Missing and 6 partials :warning:
...api/api_v2/pathfinding/PathfindingBlockResponse.kt	57.14%	2 Missing and 7 partials :warning:
...r/sncf/osrd/signaling/impl/MockSigSystemManager.kt	0.00%	1 Missing :warning:
...n/fr/sncf/osrd/api/api_v2/stdcm/STDCMEndpointV2.kt	0.00%	1 Missing :warning:

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Additional details and impacted files

@@                                  Coverage Diff                                   @@
##             display_pathfinding_constraints_on_shortest_path    #7953      +/-   ##
======================================================================================
+ Coverage                                               27.18%   27.21%   +0.03%     
- Complexity                                               2127     2129       +2     
======================================================================================
  Files                                                    1310     1310              
  Lines                                                  157738   157815      +77     
  Branches                                                 3257     3271      +14     
======================================================================================
+ Hits                                                    42881    42953      +72     
+ Misses                                                 112877   112867      -10     
- Partials                                                 1980     1995      +15     

Flag	Coverage Δ
core	75.59% <72.67%> (+0.14%)	:arrow_up:
editoast	64.20% <ø> (-0.03%)	:arrow_down:
front	10.38% <ø> (ø)
gateway	2.03% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	73.18% <ø> (ø)

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