fix(planning_evaluator): update lateral_trajectory_displacement to absolute value (#9696)

* fix(planning_evaluator): update lateral_trajectory_displacement to absolute value

Signed-off-by: Kasunori-Nakajima <kazunori.nakajima@tier4.jp>

* style(pre-commit): autofix

---------

Signed-off-by: Kasunori-Nakajima <kazunori.nakajima@tier4.jp>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: Kazunori-Nakajima

Diff for: evaluator/autoware_planning_evaluator/src/metrics/deviation_metrics.cpp

@@ -58,7 +58,8 @@ Accumulator<double> calcLocalLateralTrajectoryDisplacement(
     autoware::motion_utils::calcLateralOffset(prev.points, ego_pose.position);
   const auto traj_lateral_deviation =
     autoware::motion_utils::calcLateralOffset(traj.points, ego_pose.position);
-  const auto lateral_trajectory_displacement = traj_lateral_deviation - prev_lateral_deviation;
+  const auto lateral_trajectory_displacement =
+    std::abs(traj_lateral_deviation - prev_lateral_deviation);
   stat.add(lateral_trajectory_displacement);
   return stat;
 }