fix: blindspot insert zero index

[taikitanaka3]

Description

fix blindspot insert duplicate stop point at index zero
note : this is only for hotfix

review procedure
to check this case works fine without dying

TODO

• remove this insert point original functions after merging this change
• replace blindspot util to motion utils

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[purewater0901]

LGTM

[codecov]

Codecov Report

Merging #1674 (484c71d) into main (df06f93) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1674      +/-   ##
==========================================
- Coverage   10.71%   10.70%   -0.02%     
==========================================
  Files        1103     1103              
  Lines       78404    78491      +87     
  Branches    18648    18727      +79     
==========================================
  Hits         8400     8400              
- Misses      61089    61172      +83     
- Partials     8915     8919       +4     

Flag	Coverage Δ		*Carryforward flag
differential	4.13% <0.00%> (?)
total	10.69% <0.00%> (ø)		Carriedforward from 7ca012b

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

Impacted Files	Coverage Δ
...city_planner/src/scene_module/blind_spot/scene.cpp	0.00% <0.00%> (ø)

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[taikitanaka3]

This case is also solved