Interpret GTFS extended route types 801-899 also as trolleybus service

[miklcct]

Summary

Fix GTFS extended route types for trolleybus (8xx).

This replaces #6086 for trolleybuses only, and add tests for existing modes (except 200-299).

Issue

None yet

Unit tests

added for more existing modes

Documentation

None

[optionsome]

If someone is using extended types between 800-899, this will change the output mode but I think they are quite rare. I would be ok with merging these changes.

[optionsome]

@flaktack does this affect your deployments?

[flaktack]

No, merging is fine with us.

[codecov]

Codecov Report

Attention: Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.

Project coverage is 69.96%. Comparing base (440498f) to head (191aec2).
Report is 81 commits behind head on dev-2.x.

Files with missing lines	Patch %	Lines
...pentripplanner/gtfs/mapping/TransitModeMapper.java	84.61%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6170      +/-   ##
=============================================
+ Coverage      69.93%   69.96%   +0.03%     
- Complexity     17730    17749      +19     
=============================================
  Files           1996     1996              
  Lines          75402    75416      +14     
  Branches        7717     7717              
=============================================
+ Hits           52731    52767      +36     
+ Misses         19995    19979      -16     
+ Partials        2676     2670       -6     

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