refactor(run_out): use util function to calculate stop point

[TomohitoAndo]

Description

Modified to use functions in motion_utils to calculate stop point.
I confirmed this works with planning simulator.

use-util-run-out-psim.mp4

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[codecov]

Codecov Report

Merging #1780 (de4d662) into main (2f379a6) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1780      +/-   ##
==========================================
- Coverage   10.35%   10.33%   -0.03%     
==========================================
  Files        1218     1218              
  Lines       87375    87551     +176     
  Branches    20224    20320      +96     
==========================================
  Hits         9051     9051              
- Misses      68874    69047     +173     
- Partials     9450     9453       +3     

Flag	Coverage Δ		*Carryforward flag
differential	4.21% <0.00%> (?)
total	10.34% <0.00%> (ø)		Carriedforward from 397f367

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

Impacted Files	Coverage Δ
...lanner/include/scene_module/run_out/path_utils.hpp	0.00% <ø> (ø)
...elocity_planner/src/scene_module/run_out/scene.cpp	0.00% <0.00%> (ø)

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LGTM