refactor(turbo-tasks): Use Return Position Impl Traits (RPIT) to reimplement GraphTraversal

[bgw]

Reimplements GraphTraversal without the manual Future implementation. This was part of an experiment to try to use RPIT in the Visit trait, but I didn't quite get that far.

This code likely didn't use RPIT when it was written because RPIT on traits wasn't stable (or even fully implemented in rustc?) at that time.

This removes some unsafe code and a use of the unstable nightly-only impl_trait_in_assoc_type feature.

Closes PACK-3796

[bgw]

• refactor(turbo-tasks): Use Return Position Impl Traits (RPIT) to reimplement GraphTraversal #74896 👈 (View in Graphite)
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[ijjk]

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