fix(behavior_path_planner): fix lane change path validation logic

[rej55]

Signed-off-by: Fumiya Watanabe rej55.g@gmail.com

Description

Before this change, external request lane change module outputs improper path.
In this change, I fixed the validation logic of lane change path.

Note:
lane_change_required_distance is equal to 0 in lane change module.
So, this change effects to external request lane change module only.

Related links

Tests performed

Tested by planning simulator.

Before

After

Notes for reviewers

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[codecov]

Codecov Report

Base: 11.71% // Head: 11.71% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (81627c2) compared to base (00b97e4).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2873      +/-   ##
==========================================
- Coverage   11.71%   11.71%   -0.01%     
==========================================
  Files        1314     1314              
  Lines       91601    91602       +1     
  Branches    24478    24479       +1     
==========================================
  Hits        10727    10727              
- Misses      69689    69690       +1     
  Partials    11185    11185              

Flag	Coverage Δ		*Carryforward flag
differential	4.67% <0.00%> (?)
total	11.71% <ø> (+<0.01%)	⬆️	Carriedforward from 00b97e4

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

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

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[zulfaqar-azmi-t4]

LGTM