fix(behavior_path_planner): fix stop path for pull_over

[kosuke55]

Description

In pull_over, ego-vehicle stops in the road lane when there is no available parking space.
However, it may not be able to stop completely at low speeds.
(getStopPath sets deceleration velocity forward, but resample inserts the current speed forward.)
In this PR, when the current velocity is less than 1.0m/s, set 0.0m/s to path and make ego stop immediately.
I changed the algorism to one that compares the previous safety state like

• safe: generate pull_out_path
• safe -> not_safe: generate new stop_path
• not_safe -> not_safe: use previous stop_path

before

2022-08-31-12-28-51.mp4

after

pull_over_stop-2022-08-31_16.02.34_trim.mp4

Related links

Tests performed

psim
(TIER IV internal scenario tests https://evaluation.tier4.jp/evaluation/reports/faf22a21-a6aa-58c7-b53c-d8c293a58c59?project_id=prd_jt)

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[codecov]

Codecov Report

Merging #1742 (7e85b3f) into main (fd0d776) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1742      +/-   ##
==========================================
- Coverage   10.38%   10.36%   -0.02%     
==========================================
  Files        1211     1211              
  Lines       87406    87533     +127     
  Branches    20282    20373      +91     
==========================================
  Hits         9075     9075              
- Misses      68849    68972     +123     
- Partials     9482     9486       +4     

Flag	Coverage Δ		*Carryforward flag
differential	1.26% <0.00%> (?)
total	10.36% <0.00%> (ø)		Carriedforward from fd0d776

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

Impacted Files	Coverage Δ
...lanner/scene_module/pull_over/pull_over_module.hpp	0.00% <ø> (ø)
...er/src/scene_module/pull_over/pull_over_module.cpp	0.00% <0.00%> (ø)

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[kosuke55]

@rej55
Thank you for your advice.
I changed the algorism to one that compares the previous safety state like

• safe: generate pull_out_path
• safe -> not_safe: generate new stop_path
• not_safe -> not_safe: use previous stop_path

[rej55]

LGTM