feat: update ClickHouse configuration for single node and cluster support

Author: ugo

charts/sentry/templates/snuba/_helper-snuba.tpl

@@ -76,7 +76,15 @@ settings.py: |
         The default clickhouse installation runs in distributed mode, while the external
         clickhouse configured can be configured any way you choose
       */}}
-      "single_node": False
+      {{- if and .Values.externalClickhouse.singleNode (not .Values.clickhouse.enabled) }}
+      "single_node": True,
+      {{- else }}
+      "single_node": False,
+      {{- end }}
+      {{- if or .Values.clickhouse.enabled (not .Values.externalClickhouse.singleNode) }}
+      "cluster_name": {{ include "sentry.clickhouse.cluster.name" . | quote }},
+      "distributed_cluster_name": {{ include "sentry.clickhouse.cluster.name" . | quote }},
+      {{- end }}
     },
   ]