If the connection pool is empty and the connect call on the newly created connection fails, we publish a GetFailed CMAP event. This event's Reason field should be set to ReasonConnectionErrored.

Incorrect event construction is at https://github.com/mongodb/mongo-go-driver/blob/a62c7d7c704d9269a5399f80e266fdefb4f5da39/x/mongo/driver/topology/pool.go#L443.