ONLY FOR SHARDED CLUSTERS since there is no database creation on replica-sets.

This investigation ticket has two objectives:

• Make sure implicit database creation can only happen via CollectionRoutingInfoTargeter (aka: there is a single entry point for implicit database creation)
  • This will guarantee it will not be possible to implicitly create a database on reads after SERVER-93173 will be completed
• Explore options to programmatically avoid adding other ways of implicitly creating databases in the future (never bypass the single entry point for implicit database creation)