Switch GTFS flex safe_duration_offset back to seconds

[leonardehrenfried]

Summary

There has been a bit of unfortunate back-and-forth when writing the spec draft for the GTFS flex duration extension. We agreed that we want to switch the field safe_duration_offset to mean seconds as other duration in the spec also us this unit.

Issue

MobilityData/gtfs-flex#79

Unit tests

Updated.

Documentation

No.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.79%. Comparing base (c7fe2f2) to head (7aea107).
Report is 26 commits behind head on dev-2.x.

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6298      +/-   ##
=============================================
- Coverage      69.79%   69.79%   -0.01%     
+ Complexity     17790    17787       -3     
=============================================
  Files           2017     2017              
  Lines          76042    76042              
  Branches        7781     7781              
=============================================
- Hits           53077    53076       -1     
  Misses         20263    20263              
- Partials        2702     2703       +1     

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