fix(behavior_path_planner): make use of the avoid_linestring.distance parameter

[maxime-clem]

Description

The avoid_linestring.distance parameter allows to set a distance to keep between the expanded drivable area and the linestrings to avoid (e.g., road_border).
This parameter was not used in the code and the functionality was not working properly. This PR fixes this.

Tests performed

Tested in Psim.

Effects on system behavior

Extra distance can be added between the expanded drivable area and the linestrings to avoid.

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[rej55]

LGTM

[codecov]

Codecov Report

Patch coverage: 4.68% and project coverage change: -0.48% ⚠️

Comparison is base (0dae23f) 14.80% compared to head (9c4300c) 14.33%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4198      +/-   ##
==========================================
- Coverage   14.80%   14.33%   -0.48%     
==========================================
  Files        1527     1585      +58     
  Lines      105594   114652    +9058     
  Branches    32065    35640    +3575     
==========================================
+ Hits        15636    16431     +795     
- Misses      72887    80580    +7693     
- Partials    17071    17641     +570     

Flag	Coverage Δ		*Carryforward flag
differential	13.07% <0.00%> (?)
total	14.29% <9.52%> (-0.52%)	⬇️	Carriedforward from 7e32b12

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

Files Changed	Coverage Δ
...ule/dynamic_avoidance/dynamic_avoidance_module.hpp	0.00% <0.00%> (ø)
...ule/dynamic_avoidance/dynamic_avoidance_module.cpp	0.00% <0.00%> (ø)
...ner/src/scene_module/dynamic_avoidance/manager.cpp	0.00% <0.00%> (ø)
...er/src/utils/drivable_area_expansion/expansion.cpp	39.87% <100.00%> (+7.46%)	⬆️

... and 380 files with indirect coverage changes

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