core: sim: ignore zero-length margin ranges

[eckter]

Fix #7845

First and second steps are overlapping operational points

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 28.68%. Comparing base (535a3db) to head (b143200).
Report is 1 commits behind head on dev.

Files	Patch %	Lines
...r/sncf/osrd/standalone_sim/StandaloneSimulation.kt	0.00%	2 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #7847      +/-   ##
============================================
- Coverage     28.69%   28.68%   -0.02%     
  Complexity     2058     2058              
============================================
  Files          1249     1249              
  Lines        154409   154412       +3     
  Branches       3040     3041       +1     
============================================
- Hits          44304    44288      -16     
- Misses       108292   108310      +18     
- Partials       1813     1814       +1     

Flag	Coverage Δ
core	74.99% <0.00%> (-0.02%)	⬇️
editoast	71.97% <ø> (-0.06%)	⬇️
front	10.01% <ø> (ø)
gateway	2.41% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	72.93% <ø> (ø)

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