Failover to the Standby Satellite Site

If the servers at site 3 are no longer viable, activate site 4. Once site 4 is activated, the messaging functions of site 3 are available at site 4. FTL configuration must still be managed at site 1 (or site 2, if site 2 happens to be active at the time).

Note: This procedure is similar to activating site 2, with the exception that the FTL configuration does not need to fail over, since it is managed by site 1, not site 3.

Clients and servers need to reconnect to site 4. Remap the DNS or restart them.
Update the realm configuration to activate messaging at site 4. This requires two changes to the persistence cluster: disable Disaster recovery replication, and make site 4's server set the active server set. (Disaster recovery replication can be re-enabled later for a planned failback.)

Reference files:
```
samples/yaml/satellite-dr/satellite-dr-sample-satdr-activate.json
```

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