editoast: return list of missing locations in pathfinding

[hamz2a]

closes #8636

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 80.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 37.16%. Comparing base (d97f288) to head (2d2ff61).
Report is 50 commits behind head on dev.

Files with missing lines	Patch %	Lines
editoast/src/views/path/path_item_cache.rs	60.00%	6 Missing ⚠️
editoast/src/views/timetable/stdcm.rs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #9113      +/-   ##
============================================
- Coverage     37.17%   37.16%   -0.01%     
- Complexity     2240     2242       +2     
============================================
  Files          1260     1262       +2     
  Lines        115463   115857     +394     
  Branches       3267     3278      +11     
============================================
+ Hits          42921    43058     +137     
- Misses        70596    70845     +249     
- Partials       1946     1954       +8     

Flag	Coverage Δ
core	74.80% <ø> (+<0.01%)	⬆️
editoast	72.54% <76.66%> (+0.16%)	⬆️
front	15.19% <100.00%> (+0.01%)	⬆️
gateway	2.22% <ø> (+<0.01%)	⬆️
osrdyne	2.57% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.46% <ø> (ø)

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[SharglutDev]

Lgtm for front part, not tested (we don't display these errors for now)

[flomonster]

Thanks! LGTM

[leovalais]

Great work! (Not tested.)

[leovalais]

Thanks!