fix(utils): make cut overlap lane logic better

[satoshi-ota]

Description

🤖 Generated by Copilot at 6f23079

This pull request enhances the behavior path planner by improving the code quality and the path point selection logic in utils.cpp. It adds a blank line for clarity and modifies the cutOverlappedLanes function to handle edge cases and avoid errors.

Tests performed

• PASS TIER IV INTERNAL SCENARIOS
• PASS TIER IV INTERNAL SCENARIOS

Effects on system behavior

Nothing.

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01% ⚠️

Comparison is base (b048ff4) 14.89% compared to head (6f23079) 14.89%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4697      +/-   ##
==========================================
- Coverage   14.89%   14.89%   -0.01%     
==========================================
  Files        1549     1549              
  Lines      106955   106969      +14     
  Branches    32790    32796       +6     
==========================================
+ Hits        15927    15928       +1     
- Misses      73635    73649      +14     
+ Partials    17393    17392       -1     

Flag	Coverage Δ		*Carryforward flag
differential	13.24% <0.00%> (?)
total	14.89% <ø> (+<0.01%)	⬆️	Carriedforward from b048ff4

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

Files Changed	Coverage Δ
planning/behavior_path_planner/src/utils/utils.cpp	15.28% <0.00%> (-0.09%)	⬇️

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