feat(behavior_path_planner): enable generating backward drivable area

[purewater0901]

Signed-off-by: yutaka purewater0901@gmail.com

Description

Enable generating backward drivable area by adding a flag.

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[codecov]

Codecov Report

Base: 10.54% // Head: 10.42% // Decreases project coverage by -0.11% ⚠️

Coverage data is based on head (faf3048) compared to base (418d8e5).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2512      +/-   ##
==========================================
- Coverage   10.54%   10.42%   -0.12%     
==========================================
  Files        1266     1265       -1     
  Lines       87648    88698    +1050     
  Branches    20937    21796     +859     
==========================================
+ Hits         9242     9248       +6     
- Misses      68543    69481     +938     
- Partials     9863     9969     +106     

Flag	Coverage Δ		*Carryforward flag
differential	3.15% <0.00%> (?)
total	10.56% <0.00%> (+0.02%)	⬆️	Carriedforward from 70d3978

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

Impacted Files	Coverage Δ
...based_prediction/src/map_based_prediction_node.cpp	0.00% <0.00%> (ø)
...havior_path_planner/behavior_path_planner_node.hpp	0.00% <ø> (ø)
...de/behavior_path_planner/behavior_tree_manager.hpp	0.00% <0.00%> (ø)
...th_planner/scene_module/scene_module_interface.hpp	0.00% <0.00%> (ø)
...lanner/include/behavior_path_planner/utilities.hpp	29.41% <ø> (ø)
...or_path_planner/src/behavior_path_planner_node.cpp	0.27% <0.00%> (+0.08%)	⬆️
...ehavior_path_planner/src/behavior_tree_manager.cpp	0.00% <0.00%> (ø)
...er/src/scene_module/avoidance/avoidance_module.cpp	0.00% <0.00%> (ø)
...rc/scene_module/lane_change/lane_change_module.cpp	0.00% <0.00%> (ø)
...nner/src/scene_module/pull_out/pull_out_module.cpp	0.00% <0.00%> (ø)
... and 32 more

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[kosuke55]

the default value of is_driving_forward is true, so it does not affect existing code.