code: void unregisterPrefetchCall(@NotNull ApolloPrefetch apolloPrefetch) {
      checkNotNull(apolloPrefetch, "apolloPrefetch == null");
      OperationName operationName = apolloPrefetch.operation().name();
      unregisterCall(activePrefetchCalls, operationName, apolloPrefetch);
    }
docs: <p>Removes provided {@link ApolloPrefetch} that finished his execution, if it is found, else throws an
  {@link AssertionError}.</p>
  
  If the removal operation is successful and no active running calls are found, then the registered
  {@link ApolloCallTracker#idleResourceCallback} is invoked.
  
  <p><b>Note</b>: This method needs to be called right after a prefetch call is completed (whether successful or
  failed).</p>