By Ted Hesson WASHINGTON (Reuters) – The Biden administration will place hundreds of migrants caught at the U.S.-Mexico border on house arrest in the coming weeks as it seeks cheaper alternatives to immigration detention, according to a notice to lawmakers and a U.S. Department of Homeland Security (DHS) official. A 120-day pilot program will be launched in Houston and Baltimore, with 100-200 single adults enrolled in each location, according to the notice, which was sent by U.S. Immigration and Customs Enforcement (ICE) and reviewed by Reuters. The so-called “home curfew” pilot will cost $6-8…