Emma Watson grew up on the “Harry Potter” set surrounded by the same faces year after year, and she came to think of them as family. So when she moved on to later films, she carried that expectation with her — that the people she worked with would become a second family too. Instead she found colleagues who kept their distance, and it wrecked her. Daniel Radcliffe, Rupert Grint, and Emma Watson, cast as Harry, Ron, and Hermione, in a Warner Bros…