[tfrt] Do not allow Status payload in AsyncValue
[tfrt] Do not allow Status payload in AsyncValue

- similar to absl::StatusOr<absl::StatusOr<T>> it is a bad idea
- it would lead to ambiguity in AsyncValueRef<T>::emplace(absl::StatusOr) and in AsyncValueRef<T>::AndThen([](absl::Status) { ... })

PiperOrigin-RevId: 474207408

tensorflow/runtime,tensorflow/runtime,tensorflow/runtime,tensorflow/runtime