Fix filtering of inconsistent NeTEx stop times

[vpaturet]

Summary

the Graph Builder does not filter out NeTEx ServiceJourneys with inconsistent stop times.

In the current implementation, the stop times validation/filtering is performed in org.opentripplanner.graph_builder.module.ValidateAndInterpolateStopTimesForEachTrip for both GTFS and NeTEx imports, but in the NeTEx case the validation occurs too late, after the creation of TripTimes, preventing proper filtering.

This PR moves the validation/filtering of stop times earlier in the import process so that incorrect trips are both reported and filtered out.
The filtering logic is also adapted to prevent filtering of valid flexible trips.

Issue

Unit tests

Added unit tests

Documentation

No

[codecov]

Codecov Report

Patch coverage: 79.50% and project coverage change: +0.16 🎉

Comparison is base (b08c994) 64.50% compared to head (c233153) 64.66%.

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #5061      +/-   ##
=============================================
+ Coverage      64.50%   64.66%   +0.16%     
- Complexity     13864    13960      +96     
=============================================
  Files           1710     1717       +7     
  Lines          67019    67303     +284     
  Branches        7203     7242      +39     
=============================================
+ Hits           43229    43524     +295     
+ Misses         21372    21346      -26     
- Partials        2418     2433      +15     

Impacted Files	Coverage Δ
...tripplanner/ext/fares/impl/GtfsFaresV2Service.java	95.96% <0.00%> (ø)
...raphqlapi/generated/LegacyGraphQLDataFetchers.java	0.00% <ø> (ø)
...legacygraphqlapi/generated/LegacyGraphQLTypes.java	7.57% <0.00%> (ø)
...pplanner/ext/siri/SiriTimetableSnapshotSource.java	0.00% <0.00%> (ø)
...er/ext/siri/updater/SiriETGooglePubsubUpdater.java	0.00% <ø> (ø)
...r/ext/siri/updater/SiriETHttpTripUpdateSource.java	0.00% <0.00%> (ø)
...pentripplanner/ext/siri/updater/SiriETUpdater.java	0.00% <0.00%> (ø)
...pentripplanner/ext/siri/updater/SiriSXUpdater.java	0.00% <0.00%> (ø)
...ner/ext/siri/updater/azure/SiriAzureETUpdater.java	0.00% <0.00%> (ø)
...ner/ext/siri/updater/azure/SiriAzureSXUpdater.java	0.00% <0.00%> (ø)
... and 83 more

... and 48 files with indirect coverage changes

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