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I think the issue here is that you need to define "laser_scan_sensor" under obstacles, not at the top-level, so your costmap_common.yaml would become:

obstacles:
   observation_sources: laser_scan_sensor
   laser_scan_sensor: {sensor_frame: laser, data_type: LaserScan, topic: scan, marking: true, clearing: true}

I think the issue here is that you need to define "laser_scan_sensor" under obstacles, not at the top-level, so your costmap_common.yaml would become:

obstacles:
   observation_sources: laser_scan_sensor
   laser_scan_sensor: {sensor_frame: laser, data_type: LaserScan, topic: scan, marking: true, clearing: true}
LaserSc...}