core: infra: ignore 0-length ranges when building zones

[eckter]

In the previous version, when the end detector was placed precisely at a transition between two tracks, we would add the chunk that starts there.

Fixes #5535

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (d8a9f7a) 19.62% compared to head (dea3062) 19.62%.
Report is 4 commits behind head on dev.

Files	Patch %	Lines
...kotlin/fr/sncf/osrd/sim_infra/impl/DebugViewers.kt	0.00%	2 Missing ⚠️
...srd/api/pathfinding/PathfindingBlocksEndpoint.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #5721      +/-   ##
============================================
- Coverage     19.62%   19.62%   -0.01%     
  Complexity     2326     2326              
============================================
  Files           886      886              
  Lines        105946   105948       +2     
  Branches       2576     2576              
============================================
  Hits          20788    20788              
- Misses        83649    83651       +2     
  Partials       1509     1509              

Flag	Coverage Δ
core	78.72% <50.00%> (-0.02%)	⬇️

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