feat(start_planner): change lateral acceleration sampling num

[kosuke55]

Description

change lateral_acceleration_sampling_num 1->3

Related links

Tests performed

psim

Notes for reviewers

Interface changes

none

Effects on system behavior

none

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (532cad0) 14.40% compared to head (984eeb6) 14.40%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4017   +/-   ##
=======================================
  Coverage   14.40%   14.40%           
=======================================
  Files        1456     1456           
  Lines      102830   102830           
  Branches    29824    29824           
=======================================
  Hits        14815    14815           
  Misses      71832    71832           
  Partials    16183    16183           

Flag	Coverage Δ		*Carryforward flag
differential	12.75% <ø> (?)
total	14.40% <ø> (ø)		Carriedforward from 532cad0

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

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