refactor(behavior_path_planner): change names in lane change module

[purewater0901]

Description

Change function and variable names that have redundant names in the lane change module.

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.81 ⚠️

Comparison is base (5ec84e3) 12.72% compared to head (072acda) 11.91%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3083      +/-   ##
==========================================
- Coverage   12.72%   11.91%   -0.81%     
==========================================
  Files        1231     1332     +101     
  Lines       87073    92933    +5860     
  Branches    24737    24735       -2     
==========================================
- Hits        11078    11076       -2     
- Misses      64515    70376    +5861     
- Partials    11480    11481       +1     

Flag	Coverage Δ		*Carryforward flag
differential	5.54% <0.00%> (?)
total	11.92% <ø> (-0.81%)	⬇️	Carriedforward from 82f1184

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

Impacted Files	Coverage Δ
...ehavior_path_planner/src/util/lane_change/util.cpp	0.00% <0.00%> (ø)

... and 103 files with indirect coverage changes

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