feat(behavior_path_planner): change straight turn signal condition

[purewater0901]

Description

Turn signal decider disable the blinker when the ego vehicle runs on a straight line at intersections. However, this causes some serious problems for the lane change and avoidance module when it tries to change lanes or avoid objects near intersections. In this PR, I change the code by disabling the blinker only when the ego vehicle stops at the intersection.

Tests performed

Scenario Test 1575/1588
TIRE IV INTERNAL LINK

Effects on system behavior

Not applicable.

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d6351fc) 14.88% compared to head (100487e) 14.88%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4507   +/-   ##
=======================================
  Coverage   14.88%   14.88%           
=======================================
  Files        1519     1519           
  Lines      105003   105002    -1     
  Branches    31994    31995    +1     
=======================================
  Hits        15631    15631           
+ Misses      72305    72303    -2     
- Partials    17067    17068    +1     

Flag	Coverage Δ		*Carryforward flag
differential	13.23% <0.00%> (?)
total	14.88% <ø> (+<0.01%)	⬆️	Carriedforward from d6351fc

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

Files Changed	Coverage Δ
...er4_state_rviz_plugin/src/autoware_state_panel.cpp	0.00% <ø> (ø)
...er4_state_rviz_plugin/src/autoware_state_panel.hpp	0.00% <ø> (ø)
.../behavior_path_planner/src/turn_signal_decider.cpp	40.72% <0.00%> (-0.30%)	⬇️
...vior_velocity_out_of_lane_module/src/decisions.cpp	1.17% <ø> (+0.02%)	⬆️

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