Update some properties for the mediawiki_history_snapshot_config DAG.
Since we changed Cassandra's AQS config table in the related Gerrit change. We should update it here. Also, taking the opportunity to update the start date of the DAG.
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Since we changed Cassandra's AQS config table in the related Gerrit change. We should update it here. Also, taking the opportunity to update the start date of the DAG.