BF-40934 is an invariant as a result of a race condition where during a primary election, nodes can step up and invoke the range deleter service, causing _onServiceUpPromise
to be created. When step up is completed, the promise will be completed asynchronously at some point in the future, while when the node is shutdown, the same promise will attempt to be completed. 

The fix is to ensure that the asynchronous _serviceUpPromise only completes if it has not already been completed.