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You need to add the observation sources inside of the plugin that should use them.

Thus, move those into the obstacle plugin like so:

 - {name: obstacle, type: "costmap_2d::ObstacleLayer"}
 - {name: inflation, type: "costmap_2d::InflationLayer"}

   observation_sources: velodyne

   velodyne: {sensor_frame: velodyne, data_type: PointCloud2, topic: velodyne_points, marking: true, clearing: true,    min_obstacle_height: -10, obstacle_range: 25, raytrace_range: 25}

  track_unknown_space: true