refactor(mission_planner): clean reroute code

[purewater0901]

Description

Clean route in mission planner to make the code shorter to improve the readability.

🤖 Generated by Copilot at 94a2418

Refactor service callbacks for routes in MissionPlanner. Introduce a new function create_route that creates a LaneletRoute from a service request and use it in the callbacks. Update the header file and documentation accordingly.

Tests performed

Planning Simulator

Effects on system behavior

Not applicable.

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[kosuke55]

seems to make the function for common processing

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (c1de8fd) 14.11% compared to head (94a2418) 14.12%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3815   +/-   ##
=======================================
  Coverage   14.11%   14.12%           
=======================================
  Files        1438     1438           
  Lines      101485   101443   -42     
  Branches    27045    27045           
=======================================
  Hits        14329    14329           
+ Misses      71472    71430   -42     
  Partials    15684    15684           

Flag	Coverage Δ		*Carryforward flag
differential	15.34% <0.00%> (?)
total	14.12% <ø> (+0.01%)	⬆️	Carriedforward from c1de8fd

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

Impacted Files	Coverage Δ
...manager_rviz_plugin/src/bag_time_manager_panel.cpp	0.00% <ø> (ø)
.../rtc_manager_rviz_plugin/src/rtc_manager_panel.cpp	0.00% <ø> (ø)
...tic_goal_rviz_plugin/src/automatic_goal_sender.cpp	0.00% <ø> (ø)
...ontrol_rviz_plugin/src/tools/manual_controller.cpp	0.00% <ø> (ø)
...er4_state_rviz_plugin/src/autoware_state_panel.cpp	0.00% <ø> (ø)
...king/include/autonomous_emergency_braking/node.hpp	0.00% <ø> (ø)
control/autonomous_emergency_braking/src/node.cpp	0.00% <ø> (ø)
...troller/src/joy_controller/joy_controller_node.cpp	0.00% <ø> (ø)
...ization/ndt_scan_matcher/src/map_update_module.cpp	0.00% <ø> (ø)
...on_planner/src/mission_planner/mission_planner.cpp	0.00% <0.00%> (ø)
... and 3 more

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