fix(autoware_motion_utils): fix unusedFunction

[Nagi70]

Description

This is a fix based on cppcheck unusedFunction warnings

common/autoware_motion_utils/src/marker/marker_helper.cpp:138:0: style: The function 'createDeletedDeadLineVirtualWallMarker' is never used. [unusedFunction]
visualization_msgs::msg::MarkerArray createDeletedDeadLineVirtualWallMarker(
^

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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 23.90%. Comparing base (a6b0df9) to head (935724d).
Report is 26 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8519   +/-   ##
=======================================
  Coverage   23.90%   23.90%           
=======================================
  Files        1381     1380    -1     
  Lines      101924   101835   -89     
  Branches    38818    38802   -16     
=======================================
- Hits        24364    24343   -21     
+ Misses      75076    75020   -56     
+ Partials     2484     2472   -12     

Flag	Coverage Δ		*Carryforward flag
differential	25.70% <ø> (?)
total	23.90% <ø> (-0.01%)	⬇️	Carriedforward from 6901256

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