Even if there is a spot in the cluster for auto-wipers and a place for the sensor to be mounted, the fact that there is isn't a programming option in TDS or GDS2 means there isn't a way to enable the functionality in the BCM.
These are the only active cluster indicators per the Chevrolet Cruze Owner's Manual. I checked both 2011 and 2012 versions and they are the same.
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These are all of the alternate names that the sensor is called in the GM parts catalogs: Rain Sensor, Temp Sensor, In-Car Sensor, Cabin Air Temperature Sensor, Humidity Sensor, Sensor. That is why you were told it was the part you are looking for.