core: stdcm: simplify stdcm edge builder

[eckter]

Turns out, starting the path with a node instead of an edge can make things much easier than before

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.90%. Comparing base (1b14ae3) to head (09cabc2).
Report is 3 commits behind head on dev.

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #8766      +/-   ##
============================================
- Coverage     36.92%   36.90%   -0.02%     
+ Complexity     2213     2208       -5     
============================================
  Files          1255     1255              
  Lines        114134   114110      -24     
  Branches       3188     3188              
============================================
- Hits          42142    42111      -31     
- Misses        70097    70104       +7     
  Partials       1895     1895              

Flag	Coverage Δ
core	74.73% <100.00%> (-0.03%)	⬇️
editoast	72.05% <ø> (-0.04%)	⬇️
front	14.92% <ø> (ø)
gateway	2.20% <ø> (ø)
osrdyne	2.71% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.45% <ø> (ø)

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[Erashin]

Yaaayyyy