core: use infra explorer in pathfinding endpoint

[Erashin]

Fixes #6784.

Use infra explorer in pathfinding endpoint. This makes us explore the graph using both blocks and routes, ensuring that if we do find a block path, the corresponding routes exist.

As intended, corrects https://github.com/osrd-project/osrd-confidential/issues/333, a path is found between Metz and Nancy:

Benchmark run on same infra: results are slightly better (up by 0.3% for a payload insaaannee), and basically we're getting less repeated_tracks errors (instead the path is just not found):

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 83.47107% with 40 lines in your changes missing coverage. Please review.

Project coverage is 39.34%. Comparing base (9a28069) to head (8bf1411).
Report is 13 commits behind head on dev.

Files with missing lines	Patch %	Lines
...thfinding/IncompatibleConstraintsPostProcessing.kt	87.50%	3 Missing and 7 partials ⚠️
.../osrd/api/pathfinding/PathfindingBlocksEndpoint.kt	57.14%	7 Missing and 2 partials ⚠️
.../api_v2/pathfinding/PathfindingBlocksEndpointV2.kt	92.18%	3 Missing and 2 partials ⚠️
...rc/main/kotlin/fr/sncf/osrd/utils/AppendOnlyMap.kt	69.23%	2 Missing and 2 partials ⚠️
.../src/main/kotlin/fr/sncf/osrd/utils/BloomFilter.kt	71.42%	0 Missing and 4 partials ⚠️
...main/kotlin/fr/sncf/osrd/graph/PathfindingGraph.kt	85.00%	3 Missing ⚠️
...sncf/osrd/stdcm/infra_exploration/InfraExplorer.kt	75.00%	1 Missing and 2 partials ⚠️
.../kotlin/fr/sncf/osrd/utils/AppendOnlyLinkedList.kt	60.00%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #9153      +/-   ##
============================================
+ Coverage     39.31%   39.34%   +0.02%     
- Complexity     2245     2267      +22     
============================================
  Files          1293     1297       +4     
  Lines         97666    97770     +104     
  Branches       3280     3297      +17     
============================================
+ Hits          38398    38468      +70     
- Misses        57329    57354      +25     
- Partials       1939     1948       +9     

Flag	Coverage Δ
core	74.98% <83.47%> (+0.04%)	⬆️
editoast	72.59% <ø> (-0.06%)	⬇️
front	10.37% <ø> (ø)
gateway	2.50% <ø> (ø)
osrdyne	3.52% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.71% <ø> (ø)

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