Andy Warhol, gentrification, and the criminal justice system are all under the microscope on the London stage this week – to varying degrees of success. The Collaboration – Young Vic ★★★★☆ In this arty drama, Andy Warhol and Jean-Michel Basquiat bare their knuckles and souls over a collaboration in the artist’s studio. Paul Bettany’s entertainingly neurotic, affecting performance as Warhol …