Replace Street type with a more general mobility_class

[Grufoony]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 87.64045% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.70%. Comparing base (ca370dd) to head (54bb301).

Files with missing lines	Patch %	Lines
src/dsf/mobility/RoadNetwork.cpp	79.41%	7 Missing ⚠️
test/mobility/Test_graph.cpp	92.30%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #494      +/-   ##
==========================================
+ Coverage   84.64%   84.70%   +0.05%     
==========================================
  Files          54       54              
  Lines        8280     8304      +24     
  Branches      971      975       +4     
==========================================
+ Hits         7009     7034      +25     
+ Misses       1256     1255       -1     
  Partials       15       15              

Flag	Coverage Δ
unittests	84.70% <87.64%> (+0.05%)	⬆️

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