refactor(behavior_velocity_planner): remove unused "findEgoIndex"

[maxime-clem]

Description

Remove 2 unused functions.

Tests performed

Not applicable.

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[kyoichi-sugahara]

LGTM

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (37f67f5) 13.21% compared to head (ca89a2e) 13.22%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3256   +/-   ##
=======================================
  Coverage   13.21%   13.22%           
=======================================
  Files        1263     1263           
  Lines       89337    89316   -21     
  Branches    27079    27074    -5     
=======================================
  Hits        11809    11809           
+ Misses      65104    65083   -21     
  Partials    12424    12424           

Flag	Coverage Δ		*Carryforward flag
differential	3.92% <ø> (?)
total	13.22% <ø> (+<0.01%)	⬆️	Carriedforward from 37f67f5

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

Impacted Files	Coverage Δ
...lanner/include/behavior_path_planner/utilities.hpp	83.33% <ø> (+59.52%)	⬆️
...nning/behavior_path_planner/src/path_utilities.cpp	0.00% <ø> (ø)
planning/behavior_path_planner/src/utilities.cpp	7.60% <ø> (+0.03%)	⬆️
...er/include/scene_module/scene_module_interface.hpp	0.00% <ø> (ø)

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