Add balanced navigation tasks (navsim format) (part 6)

navigation_tasks/grids/scene_06m_019__clearpath_jackal.npz

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navigation_tasks/grids/scene_06m_019__pal_tiago.json

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+}

navigation_tasks/grids/scene_06m_019__pal_tiago.npz

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navigation_tasks/grids/scene_06m_020__clearpath_dingo.json

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navigation_tasks/grids/scene_06m_020__clearpath_dingo.npz

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navigation_tasks/grids/scene_06m_020__clearpath_husky.json

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navigation_tasks/grids/scene_06m_020__clearpath_jackal.json

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navigation_tasks/grids/scene_06m_020__clearpath_jackal.npz

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navigation_tasks/grids/scene_06m_020__pal_tiago.json

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navigation_tasks/grids/scene_06m_021__clearpath_dingo.json

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