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The cdc_topology_description table will be used internally by nodes to send new CDC stream generations to other nodes. The cdc_description table is a user-facing table, used to inform users about new sets of CDC streams. Regenerate sstables and digests for schema_change_test. We don't need to protect this change by a schema feature: when a node creates these tables, it announces them to all other nodes. If schema agreement happens before this migration, all nodes will use a digest calculated without these tables. If it happens after, then all nodes will eventually know about these tables and use a digest calculated with these tables.