core: use nodes in stdcm priority queue and replace weight by clear comparison

[Erashin]

Fixes #7581 and #7582.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.67%. Comparing base (22d010d) to head (5acf0be).
Report is 25 commits behind head on dev.

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #7830      +/-   ##
============================================
+ Coverage     28.65%   28.67%   +0.02%     
- Complexity     2058     2059       +1     
============================================
  Files          1247     1249       +2     
  Lines        154280   154443     +163     
  Branches       3031     3040       +9     
============================================
+ Hits          44202    44292      +90     
- Misses       108276   108337      +61     
- Partials       1802     1814      +12     

Flag	Coverage Δ
core	75.01% <100.00%> (-0.01%)	⬇️
editoast	71.99% <ø> (+0.14%)	⬆️
front	10.01% <ø> (+<0.01%)	⬆️
gateway	2.34% <ø> (-0.07%)	⬇️
railjson_generator	87.49% <ø> (ø)
tests	73.16% <ø> (+0.23%)	⬆️

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[eckter]

TBD: probably a regression on potentially infinite remaining time (use max with max running time). Also not sure about the default value to 0.0 in STDCMNode.remainingTime, could actually be Double.Infinity.

Exiting early should be mostly straightforward, like if (node.timeSinceDeparture + node.remainingTimeEstimation > maxRunTime) return null just after getting a node. We don't have the time since departure yet, but we already need to add it for other reasons

Also not sure about the default value to 0.0 in STDCMNode.remainingTime, could actually be Double.Infinity.

We shouldn't have no value there. Ideally there shouldn't be any default value, or null if we can't have it when initializing (with !! when getting the value).

If we do want a default value, it should be optimistic (i.e. 0)