followers tablets compatibility for running databases in limited set datacenters

[kobzonega]

Case:

I have YDB cluster consisting of 5 datacenters, but the database nodes are running only in 3 out of 5 datacenters. After updating the cluster to version 24-4-2 with a new logic for launching followers binded to a specific datacenter, the Hive tablet tries to launch tablets in all the datacenters in the cluster and put tablets in the Wait Queue.

Expected behavior:

After upgrading the cluster to a new version, the Hive tablet will not attempt to run tablets in a datacenter that does not have any database nodes running.