LatencySensitive featureset must be removed

LatencySensitive has been functionally equivalent to "" (Default) for several years. Code has forgotten that the featureset must be handled and its more efficacious to remove the featureset (with migration code) than try to plug all the holes.

To ensure this is working, update a cluster to use LatencySensitve and see that the FEatureSet value is reset after two minutes