fix(goal_planner): fix object extraction area

[kosuke55]

Description

fix #8714

especially when bound has only two points, polygon can be created correctly

before

after

Related links

Parent Issue:

psim

2024/09/05 https://evaluation.tier4.jp/evaluation/reports/ea173245-3b3b-5acc-880d-b783123747af/?project_id=prd_jt

fix UC-v3-F-04-00003_005_case01_cmn_general:10

before

after

How was this PR tested?

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 24.12%. Comparing base (1ae6082) to head (16d04d9).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
...are_behavior_path_goal_planner_module/src/util.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8764      +/-   ##
==========================================
- Coverage   24.13%   24.12%   -0.02%     
==========================================
  Files        1407     1411       +4     
  Lines      102317   102374      +57     
  Branches    38830    38832       +2     
==========================================
  Hits        24699    24699              
- Misses      75045    75102      +57     
  Partials     2573     2573              

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <0.00%> (?)
total	24.13% <ø> (+<0.01%)	⬆️	Carriedforward from 1ae6082

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