fix(behavior_path_planner): reset previous modified goal

[kosuke55]

Description

reset previous modified goal when new rouet is received.

if the modified goal for the new route is the same as previous one, the modified goal is not published in
https://github.com/autowarefoundation/autoware.universe/blob/feat/mrm-pull-over-manager/planning/behavior_path_planner/src/behavior_path_planner_node.cpp#L571-L575

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

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[codecov]

Codecov Report

Attention: 1279 lines in your changes are missing coverage. Please review.

Comparison is base (765a596) 15.32% compared to head (36abfc7) 10.24%.
Report is 159 commits behind head on main.

Files	Patch %	Lines
...anner/src/utils/avoidance/shift_line_generator.cpp	13.19%	435 Missing and 65 partials ⚠️
.../scene_module/goal_planner/goal_planner_module.cpp	0.58%	168 Missing and 2 partials ⚠️
...er/src/scene_module/avoidance/avoidance_module.cpp	10.48%	111 Missing and 17 partials ⚠️
...ule/dynamic_avoidance/dynamic_avoidance_module.cpp	1.92%	97 Missing and 5 partials ⚠️
...cene_module/start_planner/start_planner_module.cpp	23.52%	68 Missing and 10 partials ⚠️
..._path_planner/src/marker_utils/avoidance/debug.cpp	0.00%	61 Missing ⚠️
...ath_planner/src/scene_module/avoidance/manager.cpp	18.86%	0 Missing and 43 partials ⚠️
...th_planner/src/scene_module/lane_change/normal.cpp	0.00%	28 Missing ⚠️
..._planner/src/scene_module/goal_planner/manager.cpp	11.53%	2 Missing and 21 partials ⚠️
...planner/src/scene_module/start_planner/manager.cpp	11.53%	6 Missing and 17 partials ⚠️
... and 19 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5785       +/-   ##
===========================================
- Coverage   15.32%   10.24%    -5.09%     
===========================================
  Files        1721       80     -1641     
  Lines      118559    11100   -107459     
  Branches    37995     6209    -31786     
===========================================
- Hits        18169     1137    -17032     
+ Misses      79657     7804    -71853     
+ Partials    20733     2159    -18574     

Flag	Coverage Δ
differential	10.24% <13.93%> (?)
total	?

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