fix(autoware_path_sampler): fix passedByValue

[kobayu858]

Description

This is a fix based on cppcheck passedByValue warnings

planning/sampling_based_planner/autoware_path_sampler/src/utils/trajectory_utils.cpp:62:38: performance: Function parameter 'traj_points' should be passed by const reference. [passedByValue]
  const std::vector<TrajectoryPoint> traj_points, const double interval)
                                     ^

planning/sampling_based_planner/autoware_path_sampler/src/utils/trajectory_utils.cpp:74:38: performance: Function parameter 'traj_points' should be passed by const reference. [passedByValue]
  const std::vector<TrajectoryPoint> traj_points, const double interval)
                                     ^

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How was this PR tested?

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.24%. Comparing base (96c1601) to head (f1d7020).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8216      +/-   ##
==========================================
- Coverage   29.25%   29.24%   -0.02%     
==========================================
  Files        1600     1606       +6     
  Lines      117735   117780      +45     
  Branches    50703    50704       +1     
==========================================
  Hits        34443    34443              
- Misses      74072    74117      +45     
  Partials     9220     9220              

Flag	Coverage Δ		*Carryforward flag
differential	12.32% <ø> (?)
total	29.25% <ø> (ø)		Carriedforward from 96c1601

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