Test multidatacenter replication

In case we want to replicate the rocq cluster to azure, the multi datacenter replication must be tested. The goal of the experiment is to:

make a traffic/cost estimation
check the viability of the replication with heterogeneous cluster (for example 5 nodes at rocq, 3 nodes in azure)
check the recovery of the cluster after a network interruption (node / full cluster / ...)
...

Migrated from T3465 (view on Phabricator)