wal: update lastWriteTime behavior #9327
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ghost
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The current behavior with the WAL code causes the
LastModifiedtime of a shard to incorrectly be reported as the modified time of the most recent WAL segment. Due to some other behavior in the WAL, that could be as recent as the last time the server started up, even if the shard hasn't seen writes in weeks or months prior to that.Required for all non-trivial PRs