Fix hang in AsyncLazy<T>.DisposeValueAsync
#1340
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This method was failing to create a JoinableTask dependency link such that a value factory that was already in progress and required the main thread would be able to get it from the `DisposeValueAsync` caller.
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This method was failing to create a JoinableTask dependency link such that a value factory that was already in progress and required the main thread would be able to get it from the
DisposeValueAsynccaller.Fixes devdiv-2169193
For the record, this fixes a bug that existed since the introduction of this method in 17.8. So while this PR fixes 17.12, I based the fixing commit in the 17.8 version so we can merge the fix into any older release if necessary.