fix: Anti-Entropy loops endlessly with empty shard (#21275) #21290
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The anti-entropy service will loop trying to copy an empty shard to a
data node missing that shard. This fix is one of two changes that
correctly create an empty shard on a new node. This fix will set the
LastModified date of an empty shard directory to the modification time
of that directory, instead of to the Unix epoch.
Fixes: #21273
(cherry picked from commit 7f300dc)
Closes ##21288
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