feat: enable Kafka replication for improved data reliability

Author: ugo

charts/sentry/values.yaml

@@ -2208,6 +2208,7 @@ kafka:
     ## Increasing the replicationFactor enhances data reliability during Kafka pod failures by replicating data across multiple brokers.
     # Note that existing topics will remain with replicationFactor: 1 when updated.
     replicationFactor: 3
+    enabled: true
     # Topic list is based on files below.
     # - https://github.com/getsentry/snuba/blob/master/snuba/utils/streams/topics.py
     # - https://github.com/getsentry/sentry/blob/master/src/sentry/conf/types/kafka_definition.py