nimbus.prater: disable log aggregation for the fleet

Zahary agreed that we need to start phasing out use of Prater.
This also helps us avoid paying extra for 10 Gbps link for aggr host.

Signed-off-by: Jakub Sokołowski <jakub@status.im>

ansible/group_vars/nimbus.prater.yml

@@ -1,4 +1,7 @@
 ---
+# Prater testnet is deprecated in favor of Holesky.
+bootstrap__rsyslog_logstash_send: false
+
 # Go-Ethereum
 geth_service_name: 'geth-goerli-{{ "%02d"|format(idx|int+1) }}'
 geth_service_path: '/docker/{{ geth_service_name }}'