fix(avoidance): fix missing parent ids

[satoshi-ota]

Description

🤖[deprecated] Generated by Copilot at 43f5930

This pull request adds and improves the functionality of the ShiftLineGenerator class, which generates shifted lines that avoid obstacles and respect the lane boundaries. It assigns the parent_ids field of the combined lines in shift_line_generator.cpp and optimizes the concatParentIds function in utils.cpp.

Related Ticket: https://tier4.atlassian.net/browse/RT1-4532

Fix following error:

[component_container_mt-29] [ERROR 1700802888.493218325] [planning.scenario_planning.lane_driving.behavior_planning.behavior_path_planner.avoidance] registerRawShiftLines(): avoid line for path_shifter must have parent_id.:(L887)

Tests performed

Psim

Effects on system behavior

Nothing.

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[satoshi-ota]

Previously, if the ids2 is empty, return ids also becomes empty even if the ids1 is NOT empty.

[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (f41d3fa) 15.28% compared to head (43f5930) 15.29%.
Report is 6 commits behind head on main.

Files	Patch %	Lines
...nning/behavior_path_avoidance_module/src/utils.cpp	0.00%	7 Missing ⚠️
...path_avoidance_module/src/shift_line_generator.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5838      +/-   ##
==========================================
+ Coverage   15.28%   15.29%   +0.01%     
==========================================
  Files        1739     1739              
  Lines      119756   120182     +426     
  Branches    36369    36657     +288     
==========================================
+ Hits        18301    18386      +85     
- Misses      80976    81252     +276     
- Partials    20479    20544      +65     

Flag	Coverage Δ		*Carryforward flag
differential	12.85% <0.00%> (?)
total	15.28% <ø> (+<0.01%)	⬆️	Carriedforward from f41d3fa

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

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