API returns the list of clones without specific order (was: "UI: Order list of clones")

Goal

Currently, the list of clones on the page of DB Lab instance (https://postgres.ai/console/XXXX/instances/XXXX) is without a specific order. This is inconvenient. We need a predefined order.

TODO / How to implement

• This must be implemented at the Database Lab API level. instance status and clone list – they both have to return the list of clones ordered by creation time, desc (the newest is the 1st).

Acceptance criteria

As a user, if I refresh the page, the list of clones doesn't change the order.