refactor(behavior_velocity_planner): output path's interval can be designated by yaml

[takayuki5168]

Description

Currently, the output path's interval of the behavior_velocity_planner is decided in the default argument of the utility function, which is hard to find and cannot be changed easily.

This PR moves the interval variable to the yaml file.

Tests performed

psim

Effects on system behavior

Nothing

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[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (5de111f) 15.23% compared to head (6ee8cf8) 15.23%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
planning/behavior_velocity_planner/src/node.cpp	0.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6023      +/-   ##
==========================================
- Coverage   15.23%   15.23%   -0.01%     
==========================================
  Files        1751     1751              
  Lines      120918   120919       +1     
  Branches    36770    36771       +1     
==========================================
  Hits        18423    18423              
  Misses      81824    81824              
- Partials    20671    20672       +1     

Flag	Coverage Δ		*Carryforward flag
differential	12.20% <0.00%> (?)
total	15.23% <ø> (+<0.01%)	⬆️	Carriedforward from 5de111f

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