fix(upgrade-tests): enlarge timeout for truncate commands

as suggested in scylladb/scylladb#22166, we make the truncate
commands timeout longer, to compensate on the fact scylla
can't support multiple truncate operation in parallel

Ref: scylladb/scylladb#22166
Ref: scylladb/scylladb#21946

sdcm/fill_db_data.py

@@ -3142,7 +3142,10 @@ def cql_create_tables(self, session):
         # Refs: /~https://github.com/scylladb/scylla/issues/5235
         time.sleep(30)
         for truncate in truncates:
-            session.execute(truncate)
+            # timeout was enlarged cause of
+            # - /~https://github.com/scylladb/scylladb/issues/22166
+            # - /~https://github.com/scylladb/scylladb/issues/21946
+            session.execute(truncate, timeout=300)
 
     @property
     def parsed_scylla_version(self):