Fix block-based interlining when importing several GTFS feeds

[leonardehrenfried]

Summary

When importing several GTFS feeds where one of them uses block-based interlining then all following imports regenerate the stay-seated transfers for all of the previous feeds. This leads to a huge number of constrained transfers which is terrible for performance.

Issue

Fixes #4467.

Unit tests

Test added.

[codecov-commenter]

Codecov Report

Base: 58.47% // Head: 58.47% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (1683c6e) compared to base (e7aa8a8).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #4468      +/-   ##
=============================================
- Coverage      58.47%   58.47%   -0.01%     
+ Complexity     11430    11429       -1     
=============================================
  Files           1512     1512              
  Lines          60101    60101              
  Branches        6829     6829              
=============================================
- Hits           35146    35145       -1     
  Misses         22894    22894              
- Partials        2061     2062       +1     

Impacted Files	Coverage Δ
...entripplanner/graph_builder/module/GtfsModule.java	71.03% <100.00%> (ø)
...g/opentripplanner/api/parameter/QualifiedMode.java	65.78% <0.00%> (-2.64%)	⬇️
...pplanner/graph_builder/module/osm/OSMDatabase.java	76.14% <0.00%> (ø)

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