(Reuters)—The U.S. Food and Drug Administration approved Samsung Bioepis Co. Ltd.’s biosimilar to AbbVie Inc.’s blockbuster rheumatoid arthritis treatment Humira, the health agency said on Tuesday. The drug, Hadlima, was developed by South Korea’s Samsung Bioepis and comes with a boxed warning, the FDA’s harshest. The agency flagged increased risk of serious infections, including tuberculosis…