Delete files older than the lowest_cleanup_slot in LedgerCleanupService::cleanup_ledger (backport #26651) #28721
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…ce::cleanup_ledger (#26651) #### Problem LedgerCleanupService requires compactions to propagate & digest range-delete tombstones to eventually reclaim disk space. #### Summary of Changes This PR makes LedgerCleanupService::cleanup_ledger delete any file whose slot-range is older than the lowest_cleanup_slot. This allows us to reclaim disk space more often with fewer IOps. Experimental results on mainnet validators show that the PR can effectively reduce 33% to 40% ledger disk size. (cherry picked from commit 99ef218)
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This is an automatic backport of pull request #26651 done by Mergify.
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