feat: set all column families (message) to maxversions=1 (#566)

as this can be changed back later if we need it

SYNC-4084

scripts/setup_bt.sh

@@ -17,6 +17,6 @@ cbt -project $PROJECT -instance $INSTANCE createtable $TABLE_NAME
 cbt -project $PROJECT -instance $INSTANCE createfamily $TABLE_NAME $MESSAGE_FAMILY
 cbt -project $PROJECT -instance $INSTANCE createfamily $TABLE_NAME $MESSAGE_TOPIC_FAMILY
 cbt -project $PROJECT -instance $INSTANCE createfamily $TABLE_NAME $ROUTER_FAMILY
-cbt -project $PROJECT -instance $INSTANCE setgcpolicy $TABLE_NAME $MESSAGE_FAMILY maxage=1s
+cbt -project $PROJECT -instance $INSTANCE setgcpolicy $TABLE_NAME $MESSAGE_FAMILY "maxage=1s or maxversions=1"
 cbt -project $PROJECT -instance $INSTANCE setgcpolicy $TABLE_NAME $MESSAGE_TOPIC_FAMILY "maxage=1s or maxversions=1"
 cbt -project $PROJECT -instance $INSTANCE setgcpolicy $TABLE_NAME $ROUTER_FAMILY maxversions=1