Draft: wikidata: add daily cleanup DAG
Depends on: !2319 (merged)
Drops old Hive partitions from wikibase_rdf and wikibase_rdf_subgraphs, and prunes PVC rdf export snapshots (ttl dumps) keeping only the last N.
Bug: T435502
Signed-off-by: Gabriele Modena gmodena@wikimedia.org
cc / @lerickson @trueg