Channels: Run TRUNCATE with alter_sync=2 (#4804)

ON CLUSTER fails since it tries to create conflicting
dll entries on each node.

Error:
```Cannot execute replicated DDL query, maximum retries exceeded.
(UNFINISHED)```

priv/data_migrations/AcquisitionChannel/sql/acquisition_channel_functions.sql.eex

@@ -11,7 +11,7 @@ ENGINE = MergeTree()
 <% end %>
 ORDER BY referrer_source;
 
-TRUNCATE TABLE acquisition_channel_source_category <%= @on_cluster_statement %>;
+TRUNCATE TABLE acquisition_channel_source_category SETTINGS alter_sync=2;
 
 INSERT INTO acquisition_channel_source_category(referrer_source, category)
 SELECT t.1 AS referrer_source, t.2 AS category
@@ -43,7 +43,7 @@ ENGINE = MergeTree()
 <% end %>
 ORDER BY referrer_source;
 
-TRUNCATE TABLE acquisition_channel_paid_sources <%= @on_cluster_statement %>;
+TRUNCATE TABLE acquisition_channel_paid_sources SETTINGS alter_sync=2;
 
 INSERT INTO acquisition_channel_paid_sources(referrer_source)
 SELECT arrayJoin({paid_sources:Array(String)}) AS referrer_source

priv/data_migrations/LocationsSync/sql/truncate-location-data-table.sql.eex

@@ -1 +1 @@
-TRUNCATE TABLE IF EXISTS location_data <%= if @cluster? do %>ON CLUSTER '{cluster}'<% end %>
+TRUNCATE TABLE IF EXISTS location_data SETTINGS alter_sync=2