Revert "Kill autovacuum before truncating"

This reverts commit 03333e5.

Author: pypt

apps/move-rows-to-shards/src/main/java/org/mediacloud/mrts/TruncateActivitiesImpl.java

@@ -30,13 +30,6 @@ public void truncateIfEmpty(String table) {
             log.info("Table '" + table + "' is empty");
         }
 
-        log.info("Killing autovacuum of '" + table + "'...");
-        Database.query(List.of(String.format("""
-                SELECT pg_cancel_backend(pid)
-                FROM pg_stat_activity
-                WHERE query ILIKE 'autovacuum:%%%s%%'
-                """, table)));
-
         log.info("Truncating table '" + table + "'...");
         Database.query(List.of("TRUNCATE " + table));