fix(start_planner): consider backward completion before preparing blinker

[soblin]

Description

In the following PRs

• fix(start_planner): start prepare blinker when autonomous mode is available #6470
• feat(strat_planner): add a prepare time for blinker before taking action for approval #6438
  I intended to "let the vehicle stop for a while before starting pull out action to turn the blinker for a specific time", but forgot the case where the vehicle first drives backward and then start pull out by forward driving. I changed it to start the "blinker preparation" when forward-driving started.

Related links

Tests performed

https://evaluation.tier4.jp/evaluation/reports/02465796-fdcb-5949-89d7-aa5dd8ec3e85?project_id=prd_jt

If the prepare time is set to 3 seconds, ego stops a for while before starting forward driving.

RT1-5582-2024-03-07_14.17.24.mp4

RT1-5582-2024-03-07_15.34.05.mp4

Notes for reviewers

Interface changes

none

Effects on system behavior

none

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[kosuke55]

LGTM!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 14.80%. Comparing base (7081a61) to head (09f4958).
Report is 1 commits behind head on main.

Files	Patch %	Lines
..._start_planner_module/src/start_planner_module.cpp	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6558      +/-   ##
==========================================
- Coverage   14.80%   14.80%   -0.01%     
==========================================
  Files        1917     1917              
  Lines      132086   132087       +1     
  Branches    39262    39262              
==========================================
  Hits        19553    19553              
- Misses      90715    90716       +1     
  Partials    21818    21818              

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <0.00%> (?)
total	14.80% <ø> (+<0.01%)	⬆️	Carriedforward from 7081a61

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