Add ID to mapper error messages

[leonardehrenfried]

Summary

Similarly to #4993 this improves the error messages when an entry from a stops.txt has an incorrect location_type, for example when you try to generate a transfer from a station to a station.

cc @NVBWSeifert

[codecov]

Codecov Report

Patch coverage: 36.36% and project coverage change: +0.02% 🎉

Comparison is base (72dcf51) 66.45% compared to head (0f4588a) 66.48%.

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #5363      +/-   ##
=============================================
+ Coverage      66.45%   66.48%   +0.02%     
- Complexity     15235    15242       +7     
=============================================
  Files           1787     1787              
  Lines          69325    69323       -2     
  Branches        7319     7319              
=============================================
+ Hits           46072    46089      +17     
+ Misses         20778    20757      -21     
- Partials        2475     2477       +2     

Files Changed	Coverage Δ
...a/org/opentripplanner/gtfs/mapping/StopMapper.java	85.36% <0.00%> (-4.38%)	⬇️
...rg/opentripplanner/gtfs/mapping/StationMapper.java	68.00% <50.00%> (-11.32%)	⬇️

... and 4 files with indirect coverage changes

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[vesameskanen]

Code looks good. However, I did some tests:

• stop_times refers to station -> error is thrown
• stop's parent station is stop -> no error
• transfer between stations -> no error
• station has parent stop -> no error

Can you double check that station mapper error throwing works as expected?

[leonardehrenfried]

Does it work with current dev-2.x?

[vesameskanen]

dev-2.x behaves the same way. I just found it odd that it seems difficult to hit that validation check. There are no regressions - just better quality code - so I will approve this PR.