feat(mission_planner): move modified goal callback for reroute

[isamu-takagi]

Description

Move callback to allow reroute when modified_route is received.
autowarefoundation/autoware#3406

Tests performed

Check /api/routing/state will be ARRIVED when the goal is changed by pull over.

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (cfecdf8) 12.37% compared to head (a6d2f60) 12.37%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3297      +/-   ##
==========================================
- Coverage   12.37%   12.37%   -0.01%     
==========================================
  Files        1368     1368              
  Lines       96003    96004       +1     
  Branches    27552    27552              
==========================================
  Hits        11877    11877              
- Misses      71588    71589       +1     
  Partials    12538    12538              

Flag	Coverage Δ		*Carryforward flag
differential	21.14% <0.00%> (?)
total	12.37% <ø> (+<0.01%)	⬆️	Carriedforward from cfecdf8

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

Impacted Files	Coverage Δ
...on_planner/src/mission_planner/arrival_checker.cpp	0.00% <ø> (ø)
...on_planner/src/mission_planner/mission_planner.cpp	0.00% <0.00%> (ø)

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