[spark] Support remove_orphan_blobs procedure. - #9812
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Stacked on the core local managed blob cleaner. Adds Spark local/distributed cleanup and procedure coverage, with parallelism validated before mode dispatch and tests for dry-run plus database-wide local/distributed cleanup.
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Purpose
Stacked on #9609. Adds Spark
CALL sys.remove_orphan_blobsfor unreferenced primary-key.managed.blobpacks.localreusesLocalManagedBlobOrphanFilesClean.executeDatabasedistributedruns a Spark DAG on the same used-pack / sidecar scan as Core (emitUsedPacks, pack identity,SKIP_MANAGED_BLOB_GC)database.*is one Spark job per table (serial + unpersist), not a union of every table, so abort gates stay per-tableparallelismis validated before mode dispatch; docs describe per-mode concurrency (distributedstays within the per-table value,localmay exceed it when several tables run at once)Tests
database.*for both modes