core: fix v2 path_with_repeated_tracks bug which ignored track direction

[Erashin]

Path_with_repeated tracks was thrown when two tracks had the same string in the pathfinding result, even with different directions.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 29.36%. Comparing base (afc1c50) to head (f914e2c).

Files	Patch %	Lines
.../api_v2/pathfinding/PathfindingBlocksEndpointV2.kt	66.66%	0 Missing and 1 partial ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #7474      +/-   ##
============================================
- Coverage     29.36%   29.36%   -0.01%     
  Complexity     2012     2012              
============================================
  Files          1177     1177              
  Lines        145975   145975              
  Branches       2871     2871              
============================================
- Hits          42867    42864       -3     
- Misses       101423   101426       +3     
  Partials       1685     1685              

Flag	Coverage Δ
core	75.13% <66.66%> (ø)
editoast	72.32% <ø> (-0.02%)	⬇️
front	9.79% <ø> (ø)
gateway	2.41% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	84.29% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.