cleanup cohort/filtering for some queries

src/queries/sql/sessions/getSessionStats.ts

@@ -81,6 +81,7 @@ async function clickhouseQuery(
         ${getDateSQL('website_event.created_at', unit, timezone)} as t,
         uniq(session_id) as y
       from website_event_stats_hourly as website_event
+      ${cohortQuery}
       where website_id = {websiteId:UUID}
         and created_at between {startDate:DateTime64} and {endDate:DateTime64}
         ${filterQuery}