fix(autoware_pure_pursuit): fix cppcheck unusedFunction

[veqcc]

Description

This is a fix based on cppcheck warning unusedFunction

control/autoware_pure_pursuit/src/autoware_pure_pursuit_core/planning_utils.cpp:168:0: style: The function 'isInPolygon' is never used. [unusedFunction]
bool isInPolygon(
^

Related links

Parent Issue:

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How was this PR tested?

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.24%. Comparing base (1ea45e6) to head (01432ef).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9276   +/-   ##
=======================================
  Coverage   29.24%   29.24%           
=======================================
  Files        1336     1336           
  Lines      102981   102980    -1     
  Branches    39958    39952    -6     
=======================================
+ Hits        30117    30118    +1     
+ Misses      69989    69986    -3     
- Partials     2875     2876    +1     

Flag	Coverage Δ		*Carryforward flag
differential	30.64% <ø> (?)
total	29.25% <ø> (+<0.01%)	⬆️	Carriedforward from 1ea45e6

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