Shein is planning to rock the runway—and rankle, perhaps, its critics. The hotly popular Chinese e-tailer will be hosting on Sunday a virtual “hybrid-special” blow-out that it describes as part concert, part fashion show. Headliners include Saweetie, The Chainsmokers, Darren Criss, Thuy, Willie Gomez, Riley Clemmons and Blu DeTiger. “Rock the Runway” will showcase “stylish…