db: clean up logic surrounding WALs, flushables #5533
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Document this subtlety that multiple flushable entries may share the same logNum.
These MinRecycleLogNum and SetMinRecycleLogNum methods were only used to ratchet the minimum log num, so this commit consolidates the two under a RatchetMinRecycleLogNum method.
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Adapt TestVersionSetSeqNums to use pebble.Peek to identify the current active MANIFEST. Previously this unit test would use the last MANIFEST file returned by the List call. Additionally, on failure this test now logs the filesystem operations executed during the test.
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A handful of small clean up items surrounding WALs and the flushable queue.