fix(behavior_velocity): clear values before adding partition

[taikitanaka3]

Description

clear duplicated values in vector

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[0x126]

LGTM

[codecov]

Codecov Report

Merging #590 (56bbb9b) into main (0abf13a) will decrease coverage by 5.06%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             main    #590      +/-   ##
=========================================
- Coverage   10.88%   5.82%   -5.07%     
=========================================
  Files         706      68     -638     
  Lines       50006    5050   -44956     
  Branches     6579     552    -6027     
=========================================
- Hits         5443     294    -5149     
+ Misses      40156    4593   -35563     
+ Partials     4407     163    -4244     

Impacted Files	Coverage Δ
...behavior_velocity_planner/src/utilization/util.cpp	26.63% <ø> (ø)
...t2_extension/test/src/test_regulatory_elements.cpp
...r4_planning_rviz_plugin/src/trajectory/display.cpp
localization/stop_filter/src/stop_filter.cpp
...t_tracker/src/tracker/model/pedestrian_tracker.cpp
...r_nodes/test/test_longitudinal_controller_node.cpp
.../euclidean_cluster/euclidean_cluster_interface.hpp
...rough_filter/passthrough_filter_uint16_nodelet.cpp
...nclude/topic_state_monitor/topic_state_monitor.hpp
...rger/src/object_association_merger/utils/utils.cpp
... and 629 more

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