feat(obstacle_avoidance_planner): make virtual wall green when no stop planning

[takayuki5168]

Description

When enable_outside_drivable_area_stop is false, which means no stop planning when the trajectory is outside the drivable area, currently we have no way to detect the trajectory outside the drivable area.
To detect it, with this PR, the virtual wall whose color is green will be published.

Tests performed

planning simulator

Effects on system behavior

Nothing

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (3b162aa) 14.31% compared to head (b6cbb0d) 14.31%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4112   +/-   ##
=======================================
  Coverage   14.31%   14.31%           
=======================================
  Files        1557     1557           
  Lines      106900   106902    +2     
  Branches    30777    30779    +2     
=======================================
+ Hits        15302    15304    +2     
- Misses      75028    75029    +1     
+ Partials    16570    16569    -1     

Flag	Coverage Δ		*Carryforward flag
differential	40.57% <0.00%> (?)
total	14.31% <ø> (+<0.01%)	⬆️	Carriedforward from 3b162aa

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

Impacted Files	Coverage Δ
planning/obstacle_avoidance_planner/src/node.cpp	40.71% <0.00%> (+0.47%)	⬆️

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[takayuki5168]

@kosuke55 Could you approve the PR