fix(behavior_path_planner): fix external lane change buffer #3549
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Description
Currently, the external lane change module generates a path till the end of the path (till the goal). However, it prevents the ego vehicle from performing lane change at the end of the path. Therefore, I modified the code to enable the module to plan a path with a necessary buffer (= minimum lane change length).
Before PR
After PR
Tests performed
Scenario Result 1329/1330
TIER IV Internal Link
Effects on system behavior
External Lane change generates a path that has a buffer to reach the goal with another lane change.
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