chore(turbo-tasks): Delete `non_local_return` support from `#[turbo_tasks::function]` (#75209)
This code was left over from when we thought that we could perform the `ResolvedVc` migration on a per-function basis by inspecting the return value of the function.
*Oh, to be so naïve! The innocence we've lost!*
Every `VcValueType` and `VcValueTrait` is a `NonLocalValue` now, so this macro option is no longer useful.