chore(behavior_velocity): parameterlize detection area length

[taikitanaka3]

Signed-off-by: tanaka3 ttatcoder@outlook.jp

Description

parameterize detection area length, this is to prevent chattering from the difference between planned and measured acc.

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[codecov]

Codecov Report

Merging #1346 (6553e69) into main (ddf5c54) will decrease coverage by 0.07%.
The diff coverage is 0.00%.

@@           Coverage Diff            @@
##            main   #1346      +/-   ##
========================================
- Coverage   9.47%   9.39%   -0.08%     
========================================
  Files       1114    1114              
  Lines      76677   77863    +1186     
  Branches   16622   17434     +812     
========================================
+ Hits        7264    7317      +53     
- Misses     62785   63798    +1013     
- Partials    6628    6748     +120     

Flag	Coverage Δ		*Carryforward flag
differential	4.94% <0.00%> (?)
total	9.45% <0.00%> (ø)		Carriedforward from ddf5c54

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

Impacted Files	Coverage Δ
...ene_module/occlusion_spot/occlusion_spot_utils.hpp	45.45% <ø> (-11.69%)	⬇️
...lanner/src/scene_module/occlusion_spot/manager.cpp	0.00% <0.00%> (ø)
...ene_module/occlusion_spot/scene_occlusion_spot.cpp	0.00% <0.00%> (ø)
...elocity_planner/src/scene_module/run_out/debug.cpp	0.00% <0.00%> (ø)
...elocity_planner/src/scene_module/run_out/utils.cpp	0.00% <0.00%> (ø)
...ocity_planner/src/scene_module/crosswalk/debug.cpp	0.00% <0.00%> (ø)
...ocity_planner/src/scene_module/stop_line/debug.cpp	0.00% <0.00%> (ø)
...city_planner/src/scene_module/blind_spot/debug.cpp	0.00% <0.00%> (ø)
...city_planner/src/scene_module/blind_spot/scene.cpp	0.00% <0.00%> (ø)
... and 16 more

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[mkuri]

LGTM