Elon Musk hopes Amber Heard and Johnny Depp are both able to “move on” from their defamation case. The billionaire businessman dated Amber, 36, for several months after her split from Johnny, and Elon has now broken his silence about his ex-girlfriend’s court case with the ‘Pirates of the Caribbean’ star. Elon, 50, wrote on Twitter: “I hope they both move on. At their best, they are each incredible.” The Tesla boss made the comments in response to a tweet sent by Lex Fridman, a research scientist at the Massachusetts Institute of Technology. Lex’s tweet read: “My takeaways from Johnny Depp vs …