feat(behavior_path_planner_common): add road_shoulder test map

[soblin]

Description

added a road_shoulder test map for unit-testing and development

Related links

Parent Issue:

• Link

How was this PR tested?

docs/data update PR

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.75%. Comparing base (c656530) to head (02a54d2).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8454      +/-   ##
==========================================
- Coverage   23.87%   23.75%   -0.13%     
==========================================
  Files        1380     1389       +9     
  Lines      101838   101681     -157     
  Branches    38775    38577     -198     
==========================================
- Hits        24315    24150     -165     
+ Misses      75047    75004      -43     
- Partials     2476     2527      +51     

Flag	Coverage Δ		*Carryforward flag
differential	15.04% <ø> (?)
total	23.83% <ø> (-0.05%)	⬇️	Carriedforward from be70b8a

*This pull request uses carry forward flags. Click here to find out more.

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