next.js

b755e1eb - refactor(turbo-tasks): Move OutputContent from memory backend into turbo-tasks, represent Empty as None (#69473)

refactor(turbo-tasks): Move OutputContent from memory backend into turbo-tasks, represent Empty as None (#69473) This is preparation for local tasks/cells in #69126. - Moves this into the `turbo-tasks` crate so that it can be used with local cells/outputs in #69126. - Remove the `Empty` state from the enum because the implementation in #69126 does not currently need that. This can still be represented using `None`.