fix(autoware_obstacle_cruise_planner): fix shadowVariable warning in generateSlowDownTrajectory

[Koichi98]

Description

This is a fix based on cppcheck warning.

src/universe/autoware.universe/planning/autoware_obstacle_cruise_planner/src/planner_interface.cpp:626:17: style: Local variable 'i' shadows outer variable [shadowVariable]
    for (size_t i = (slow_down_start_idx ? *slow_down_start_idx : 0); i <= *slow_down_end_idx;
                ^
src/universe/autoware.universe/planning/autoware_obstacle_cruise_planner/src/planner_interface.cpp:579:15: note: Shadowed declaration
  for (size_t i = 0; i < obstacles.size(); ++i) {
              ^
src/universe/autoware.universe/planning/autoware_obstacle_cruise_planner/src/planner_interface.cpp:626:17: note: Shadow variable
    for (size_t i = (slow_down_start_idx ? *slow_down_start_idx : 0); i <= *slow_down_end_idx;

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

Interface changes

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 6.52%. Comparing base (507e3f4) to head (e7b5f39).
Report is 122 commits behind head on main.

Files	Patch %	Lines
..._obstacle_cruise_planner/src/planner_interface.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #7659       +/-   ##
==========================================
- Coverage   14.84%   6.52%    -8.33%     
==========================================
  Files        1999     138     -1861     
  Lines      139163   14530   -124633     
  Branches    43716    2538    -41178     
==========================================
- Hits        20661     948    -19713     
+ Misses      95731   13473    -82258     
+ Partials    22771     109    -22662     

Flag	Coverage Δ
differential	6.52% <0.00%> (?)
total	?

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