core: add v2 conflict detection endpoint

[Erashin]

Fixes #6905. Convert V2 payload to V1 structs to use them in Conflicts.kt, because stdcm is not v2 yet and still calls conflict detection with v1 structs.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 32.38636% with 119 lines in your changes are missing coverage. Please review.

Project coverage is 18.58%. Comparing base (1fae581) to head (73c143f).

Files	Patch %	Lines
...pi/api_v2/conflicts/ConflictDetectionEndpointV2.kt	0.00%	46 Missing ⚠️
.../api_v2/pathfinding/PathfindingBlocksEndpointV2.kt	21.05%	10 Missing and 5 partials ⚠️
.../api/api_v2/conflicts/ConflictDetectionResponse.kt	0.00%	14 Missing ⚠️
...rd/api/api_v2/standalone_sim/SimulationResponse.kt	7.14%	13 Missing ⚠️
...d/api/api_v2/conflicts/ConflictDetectionRequest.kt	0.00%	12 Missing ⚠️
...rd/api/api_v2/standalone_sim/SimulationEndpoint.kt	0.00%	6 Missing ⚠️
...kotlin/fr/sncf/osrd/utils/json/UnitJsonAdapters.kt	0.00%	4 Missing and 1 partial ⚠️
.../kotlin/fr/sncf/osrd/sim_infra/utils/InfraUtils.kt	0.00%	3 Missing ⚠️
...f/osrd/standalone_sim/ScheduleMetadataExtractor.kt	0.00%	3 Missing ⚠️
...api/api_v2/pathfinding/PathfindingBlockResponse.kt	33.33%	2 Missing ⚠️

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Additional details and impacted files

@@              Coverage Diff              @@
##                dev    #7345       +/-   ##
=============================================
- Coverage     29.13%   18.58%   -10.55%     
+ Complexity     2020     2016        -4     
=============================================
  Files          1137      887      -250     
  Lines        139713   112304    -27409     
  Branches       2755     2769       +14     
=============================================
- Hits          40707    20874    -19833     
+ Misses        97397    89814     -7583     
- Partials       1609     1616        +7     

Flag	Coverage Δ
core	76.32% <19.04%> (-0.69%)	⬇️
editoast	?
front	9.35% <100.00%> (+<0.01%)	⬆️
gateway	2.43% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	83.96% <ø> (ø)

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[woshilapin]

I've reviewed only the editoast part. There is at least one comment about the redundancy of information that I'd like to be addressed (or be convinced it's good as-is). The 2 other comments are minor. Apart from that, thanks for the good work, and long live v2!

[woshilapin]

Thanks for the pair programming, looks good for editoast 🎉

[woshilapin]

Maybe these endpoints should be added to the core/openapi.yaml.