branch-3.1: [enhancement](backup) handle dropped tables and partitions during backup #52935#54289
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…kup (#52935) ### What problem does this PR solve? Issue Number: close #52274 Problem Summary: When a backup is running, dropping a table, dropping a partition or truncating a table would cause backup failure because BE cannot find some tablets. This fix: 1. Add droppedTables and droppedPartitionsByTable fields to track dropped objects during backup 2. Filter out dropped tables and partitions during backup This ensures backup jobs can complete successfully even when tables or partitions are dropped during the backup process. Co-authored-by: ylh <ylh@example.com>
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Cherry-picked from #52935