fix(obstacle_avoidance_planner, path_smoother): change logger level of debug print

[takayuki5168]

Description

Fixes #6205

Changed the logger level of debug print from WARN to DEBUG.

Tests performed

psim

Effects on system behavior

Nothing

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[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (bd4b5ca) 14.36% compared to head (b3ee348) 14.36%.

Files	Patch %	Lines
...tacle_avoidance_planner/utils/trajectory_utils.hpp	0.00%	2 Missing ⚠️
...r/include/path_smoother/utils/trajectory_utils.hpp	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6298   +/-   ##
=======================================
  Coverage   14.36%   14.36%           
=======================================
  Files        1907     1907           
  Lines      130136   130136           
  Branches    37640    37640           
=======================================
  Hits        18697    18697           
  Misses      90430    90430           
  Partials    21009    21009           

Flag	Coverage Δ		*Carryforward flag
differential	33.24% <0.00%> (?)
total	14.36% <ø> (+<0.01%)	⬆️	Carriedforward from bd4b5ca

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

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