There is a lovely story of friendship, grief and starting over at the heart of “Eleanor the Great.” The film, directed by Scarlett Johansson in her feature debut, gets tangled in a plot contrivance that is, at best, unnecessary and at worst, loathsome. That’s the problem with the elevator pitch mentality, though. A story about a 90-something trying to make friends in a new city might sound a little too simple, a little too straightforward. What if she does so by pretending to be a Holocaust survivor? I’m not kidding. Eleanor is played by June Squibb (the great). At 94-years-old,...