feat(behavior_path_planner): fix goal velocity

[purewater0901]

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

Description

Change terminal velocity by using zero-order hold instead of using linear interpolation

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[taikitanaka3]

LGTM

This PR might affect motion velocity smoother's velocity 1m around goal position

[codecov]

Codecov Report

Merging #1497 (5e4bcc9) into main (05f6a6b) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1497      +/-   ##
==========================================
- Coverage   10.36%   10.31%   -0.06%     
==========================================
  Files        1135     1135              
  Lines       79574    80028     +454     
  Branches    18534    18873     +339     
==========================================
  Hits         8251     8251              
- Misses      63122    63533     +411     
- Partials     8201     8244      +43     

Flag	Coverage Δ		*Carryforward flag
differential	0.79% <0.00%> (?)
total	10.35% <0.00%> (ø)		Carriedforward from e64b2ff

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

Impacted Files	Coverage Δ
...lanner/scene_module/avoidance/avoidance_module.hpp	0.00% <ø> (ø)
...er/src/scene_module/avoidance/avoidance_module.cpp	0.00% <0.00%> (ø)
planning/behavior_path_planner/src/utilities.cpp	0.81% <0.00%> (-0.24%)	⬇️

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