backup: implement backup compactions after incremental backups #138347
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To support backup compactions, we need to be able to write MVCC keys to a file sink one key at a time. The current `fileSinkSST` only supports writing KV export responses, or essentially one span at a time. This commit adds an implementation that supports writing key by key. Epic: none Release note: None
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This commit supports compacting backups after each incremental backup if the chain has reached a certain threshold. Epic: none Release note: None
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This commit supports compacting backups after each incremental backup if the chain has reached a certain threshold.
Epic: none
Release note: None