core: infra: ignore OP parts on missing tracks

[eckter]

This isn't an error in the infra editor and can't really be fixed, and users prefer that we go toward the "ignore/warning" route.

I would have included an actual warning, but that requires #6925 first.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 29.33%. Comparing base (75eb1dd) to head (4d85af6).

Files	Patch %	Lines
.../sim_infra/impl/new_impl/RawInfraFromRjsBuilder.kt	0.00%	1 Missing and 1 partial ⚠️
.../src/main/kotlin/fr/sncf/osrd/RawInfraRJSParser.kt	85.71%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #7519      +/-   ##
============================================
- Coverage     29.34%   29.33%   -0.01%     
  Complexity     2012     2012              
============================================
  Files          1197     1197              
  Lines        147037   147041       +4     
  Branches       2890     2891       +1     
============================================
- Hits          43146    43136      -10     
- Misses       102191   102203      +12     
- Partials       1700     1702       +2     

Flag	Coverage Δ
core	75.04% <66.66%> (-0.02%)	⬇️
editoast	72.49% <ø> (-0.04%)	⬇️
front	9.76% <ø> (ø)
gateway	2.41% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	84.23% <ø> (ø)

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