[roll] Roll fuchsia [fuchsia-async] Remove WeakScopeRef, Join::detach() As the documentation explains, the type is unnecessary because it can't be used to create cycles that didn't already exist. A ScopeRef can be held by a user's task code, but each Task already holds a ScopeRef, so it would just be redundant. WeakScopeRef does prevent cycles in the internal ownership graph. Testing this also exposed a flaw in the Join API. The intention was to allow cancelling or detaching after polling the Join future, but Join is not Unpin, so those methods must accept `Pin<&mut Self>` to be useful. Admittedly this is a clunky API to use. I fixed cancel() but removed detach() since implementing it would require putting the inner scope in an Option and for the rare cases that would ever need it, mem::drop() is a way out. Original-Bug: 339724492 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1152733 Original-Revision: fe0477726529afe531f46ad709390d1bc7f035b7 GitOrigin-RevId: d0bb73591d0ab2a669bfd60bc9d3e57f99a1964f Change-Id: I6825192a0a6bc199ef9bc58fa8d5090a8c6bfd11
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