Add direct journal writer to uffizi

Close T1825.

Depends on !31 (closed)

Test Plan

sensible octocatalog-diff output on uffizi

---

Migrated from D1601 (view on Phabricator)

data/hostname/uffizi.softwareheritage.org.yaml

@@ -20,6 +20,12 @@ swh::deploy::storage::config:
                 root: "%{hiera('swh::deploy::storage::directory')}"
                 slicing: "0:2/2:4/4:6"
             - "%{alias('swh::remote_service::objstorage::config::azure')}"
+      journal_writer:
+        cls: kafka
+        args:
+          brokers: "%{alias('swh::deploy::journal::brokers')}"
+          prefix: "%{alias('swh::deploy::journal::prefix')}"
+          client_id: "swh.storage.journal_writer.%{::swh_hostname.short}"
 
 # Deploy the indexer storage server as a public resource
 swh::deploy::indexer::storage::backend::listen::host: 0.0.0.0