Fix mismatching BlockContents::has_trailer #12955
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mm304321141
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BlockFetcher::ReadBlockContents()
|-- ReadBlock()
|-- UncompressSerializedBlock()
|-- InsertUncompressedBlockToPersistentCacheIfNeeded()
for this code path, we insert a BlockContent into persistent cache .
the BlockContent is from UncompressSerializedBlock, it has no trailer
but at next call to BlockFetcher::ReadBlockContents()
we will get the BlockContent from TryGetUncompressBlockFromPersistentCache()
and it set the BlockContent::has_trailer to true ???