fix(avoidance): update filtering logic for non-vehicle

[satoshi-ota]

Description

Fow now, unknown objects tracking result is more unstable than other class objects. Sometimes, ghost unknown object is detected and avoidance module generates unnecessary path.

In this PR, I added another target filtering logic for unknown to keep current path until module confirmed the unknown is actually exist and keeps stopping more that 3.0 seconds.

Related Ticket: https://tier4.atlassian.net/browse/RT1-5044

simplescreenrecorder-2024-01-29_11.47.52.mp4

Tests performed

• PASS TIER IV INTERNAL SCENARIOS

Effects on system behavior

Suppress unnecessary avoidance behavior.

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[codecov]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (f9ed5b0) 14.58% compared to head (7bad705) 14.58%.
Report is 6 commits behind head on main.

Files	Patch %	Lines
...nning/behavior_path_avoidance_module/src/utils.cpp	0.00%	15 Missing ⚠️
...nning/behavior_path_avoidance_module/src/debug.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6206      +/-   ##
==========================================
- Coverage   14.58%   14.58%   -0.01%     
==========================================
  Files        1878     1878              
  Lines      128023   128037      +14     
  Branches    37468    37474       +6     
==========================================
  Hits        18673    18673              
- Misses      88376    88390      +14     
  Partials    20974    20974              

Flag	Coverage Δ		*Carryforward flag
differential	13.08% <0.00%> (?)
total	14.58% <ø> (+<0.01%)	⬆️	Carriedforward from f9ed5b0

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

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[shmpwk]

LGTM