fix(autoware_behavior_path_goal_planner_module): remove unused function plot_goal_candidates()

[veqcc]

Description

Fixed cppcheck warning

planning/behavior_path_planner/autoware_behavior_path_goal_planner_module/examples/plot_map_case1.cpp:138:0: style: The function 'plot_goal_candidates' is never used. [unusedFunction]
void plot_goal_candidates(

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Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.78%. Comparing base (f16ff53) to head (8b9084b).
Report is 35 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9752      +/-   ##
==========================================
+ Coverage   29.71%   29.78%   +0.07%     
==========================================
  Files        1448     1449       +1     
  Lines      108886   108604     -282     
  Branches    42746    42636     -110     
==========================================
- Hits        32354    32347       -7     
+ Misses      73349    73074     -275     
  Partials     3183     3183              

Flag	Coverage Δ		*Carryforward flag
differential	0.51% <ø> (?)
total	29.80% <ø> (+0.08%)	⬆️	Carriedforward from 4045fb3

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