feat(route_handler): add route clear function

[purewater0901]

Description

Add route clear function

🤖 Generated by Copilot at 33f1afc

Added a clearRoute function to the RouteHandler class to reset the route state. This function is used by the RouteGenerator class to handle new or invalid route requests.

Related Links: #3334

Tests performed

Not applicable.

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[kosuke55]

LGTM

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.80 🎉

Comparison is base (91ac2bc) 12.33% compared to head (e2349d1) 13.14%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3338      +/-   ##
==========================================
+ Coverage   12.33%   13.14%   +0.80%     
==========================================
  Files        1379     1280      -99     
  Lines       96686    90733    -5953     
  Branches    27971    27969       -2     
==========================================
  Hits        11928    11928              
+ Misses      72090    66135    -5955     
- Partials    12668    12670       +2     

Flag	Coverage Δ		*Carryforward flag
differential	4.98% <0.00%> (?)
total	13.16% <ø> (+0.83%)	⬆️	Carriedforward from b33d4bb

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

Impacted Files	Coverage Δ
...nclude/behavior_path_planner/util/safety_check.hpp	0.00% <0.00%> (ø)
...lanner/include/behavior_path_planner/utilities.hpp	100.00% <ø> (+16.66%)	⬆️
...lanner/src/scene_module/avoidance_by_lc/module.cpp	0.00% <0.00%> (ø)
...ane_change/external_request_lane_change_module.cpp	0.00% <0.00%> (ø)
...rc/scene_module/lane_change/lane_change_module.cpp	0.00% <0.00%> (ø)
...ehavior_path_planner/src/util/lane_change/util.cpp	0.00% <0.00%> (ø)
...ng/behavior_path_planner/src/util/safety_check.cpp	0.00% <0.00%> (ø)
planning/behavior_path_planner/src/utilities.cpp	9.96% <ø> (+1.33%)	⬆️
planning/route_handler/src/route_handler.cpp	11.33% <0.00%> (-0.13%)	⬇️

... and 102 files with indirect coverage changes

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