The authoritative shard catalog collections (e.g. config.shard.catalog.collections) is created on all shards, including the dedicated config server which is the DB-primary shard for the config DB (for the config.system.sessions sharded collection).

On FCV downgrade to 8.0 we intend to drop the authoritative shard catalog collections from all shards, however a dedicated config server is missed because it does not get listed by ShardRegistry::getAllShards.

We should also drop the collections from a dedicated config server.