Allow bike walking through bicycle no thru traffic areas

[richardkoszegi]

Summary

Allows bike walking through bicycle no thru traffic areas.

Issue

Fixes #6178

Unit tests

Added 3 tests to verify bicycle traverse through bicycle no through edges (the restricted edge is in the start - middle - end).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Report is 57 commits behind head on dev-2.x.

Additional details and impacted files

@@            Coverage Diff             @@
##             dev-2.x    #6179   +/-   ##
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  Coverage           ?   69.93%           
  Complexity         ?    17734           
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  Files              ?     1996           
  Lines              ?    75411           
  Branches           ?     7722           
==========================================
  Hits               ?    52741           
  Misses             ?    19993           
  Partials           ?     2677           

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[vesameskanen]

Looks good to me. Some notes, though:

• I wonder if we should change bicycle nothru island pruning logic now.
• Would it make sense to filter the first item away from the assertPath func of bikewalk tests?