By Maria Caspani (Reuters) -Florida Governor Ron DeSantis on Monday signed a Republican-backed bill that bans classroom instruction on sexual orientation and gender identity for many young students, drawing swift criticism from companies, Democrats and advocacy groups. The legislation, referred to by its opponents as the “don’t say gay” bill, has stirred national controversy and got attention during Sunday’s Oscars telecast amid an increasingly partisan debate over what schools should teach children about race and gender. Formally called the “Parental Rights in Education” bill, the Florida mea…