Dame Helen Mirren says she has made an “endless litany” of mistakes in her decades-long career. The Oscar-winner, 78, who got the acting bug after seeing a production of ‘Hamlet’ as a child, is laden with awards and was made a dame for services to drama in 2003. But she is quoted in the new issue My Weekly magazine saying about how she got to the top by trial and a lot of error: “I turned down projects I should have said yes tom doe projects I should have said no to, had relationships with people that I shouldn’t have had relationships with, got drunk at times that I shouldn’t have got drunk a…