Commits on Aug 11, 2023

1. backupccl: skip backing up excluded spans …

   Previously we sent export requests to all spans being backed up. The ranges for spans
   of tables that had set the flag to exclude data from backup would reply with an
   empty response, excluding their data, but the backup process still sent these
   ranges these requests.
   
   This changes the backup process to not send requests for spans from excluded tables,
   when performing database, table, or cluster backups. Backups of tenants will still send
   export requests to every range for the tenant span, and those ranges that host tables
   that are excluded will continue to reply with no data.
   
   This is done both as an optimization, and so that backups can succeed even when a
   table is unavailable, if, and only if, that table is excluded.
   
   Release note (ops change): BACKUP now skips contacting the ranges for tables on which exclude_data_from_backup is set, and can thus succeed even if an excluded table is unavailable.
   Epic: none.

   

   dt committed Aug 11, 2023
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