AsyncObseravableBase: Fix in case of exceptions thrown synchronously #2213
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IAsyncObserver<T> OnNextAsync, OnCompletedAsync and OnErrorAsynccan all throw exceptions synchronously,This is not handled correctly in AsyncObseravableBase, and the execution flow will follow a different path of the asynchronous one.
A concrete issue caused by this, is that if a synchoronous exception is thrown inside OnCompleteAsync,
AutoDetachAsyncObserverwill not Dispose the subscription automatically