A federal judge has agreed to fast-track a lawsuit filed last week against Cook County Sheriff Thomas J. Dart that calls for him to release or transfer detainees from the county jail to protect them against the spread of the novel coronavirus.The proposed class-action suit, to which Dart is named a defendant, asks that detainees who have pre-exisiting health conditions or are older be released from the jail because they are at an increased risk if they contract the virus.U.S. District Judge Matthew F. Kennelly approved …