Behind the scenes of Florida Grand Opera’s “Carmen,” there are intriguing legacies: This will be the 24th production for mezzo soprano Ginger Costa-Jackson who will be singing the role of “Carmen”; Julia Lemigova, one of the stars of the reality television series “The Real Housewives of Miami,” is in the production in a role that has always been miniscule but now has more stage time; and director Maria Todaro comes from a long line of “Carmen” history – her mother, a celebrated Brazilian mezzo-soprano, has sung the role of Carmen 250 times.