As part of the wikibase service migration a temporary factory class to generate instances of SingleEntitySourceServices was created in order to mitigate the usage of such services in prefetching callback definitions.
Once the services used in these callbacks are migrated into WikibaseClient.ServiceWiring and WikibaseRepo.ServiceWiring, this factory service is no longer needed, and can be removed. These services are:
See child tasks for more information.
Depends on T277858: Stop Passing an instance of SingleEntitySourceServices into PrefetchingTermLookup callbacks