The server now has a new built-in role, `directShardOperations`. In 6.0, assigning this role to a user is a no-op and gives it no privileges. In post-6.0 releases, auth-enabled clusters will begin restricting direct operations on shards to authenticated users that have the `directShardOperations` role.

Description of Linked Ticket

We want to create this "placeholder" role in 6.0.0 that servers no purpose so that 7.0.0 binaries can start blocking direct shard operations (rather than going through a mongos) without having to gate on FCV. Atlas and OM will assign this role to their agents in 6.0 to make the 7.0 transition seamless. In 7.0 the role will start giving users privileges to write directly to shards.