fix(raw_vehicle_cmd_converter): csv paths are resolved in param.yaml

[zhiwango]

…(autowarefoundation#6476)

Description

accel_map.csv, brake_map.csv, steer_map.csvのパス設定はyamlファイルに移動した。
autowarefoundation/autoware.universe側のPRをcherry-pickしました。

Related links

autowarefoundation#6476

Tests performed

ros2 launch j6_gen1_launch vehicle_interface.launch.xml で起動すると、map_pathが正しく読み込んでいることは確認できました。

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