feat(obstacle_cruise_planner): suppress flickering to entry slow down

[takayuki5168]

Description

suppress flickering of slow down entry/exit

Tests performed

planning simulator & real vehicle

Effects on system behavior

Nothing

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[codecov]

Codecov Report

Patch coverage: 2.15% and project coverage change: -0.01 ⚠️

Comparison is base (66918d8) 15.06% compared to head (200cc50) 15.05%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3904      +/-   ##
==========================================
- Coverage   15.06%   15.05%   -0.01%     
==========================================
  Files        1340     1341       +1     
  Lines       95628    95698      +70     
  Branches    27311    27342      +31     
==========================================
+ Hits        14404    14406       +2     
- Misses      65416    65478      +62     
- Partials    15808    15814       +6     

Flag	Coverage Δ		*Carryforward flag
differential	8.57% <2.15%> (?)
total	15.06% <ø> (+<0.01%)	⬆️	Carriedforward from 66918d8

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

Impacted Files	Coverage Δ
...include/obstacle_cruise_planner/common_structs.hpp	9.52% <0.00%> (-0.48%)	⬇️
...lude/obstacle_cruise_planner/planner_interface.hpp	13.51% <ø> (ø)
planning/obstacle_cruise_planner/src/node.cpp	12.51% <0.00%> (-0.54%)	⬇️
.../obstacle_cruise_planner/src/planner_interface.cpp	8.16% <0.00%> (-0.67%)	⬇️
...e_planner/include/obstacle_cruise_planner/node.hpp	11.11% <11.11%> (ø)

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