Fix unique key generation [BTS-2209] #21913
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This addresses https://arangodb.atlassian.net/browse/BTS-2209
The problem arises if there is an AQL INSERT statement in a loop
for a collection which has either exactly one shard or it has
multiple shards and the option
forceOneShardAttributeValueisused for the case that no user-specified
_keyis given.Design doc: https://github.com/arangodb/documents/blob/master/DesignDocuments/03_IN_PROGRESS/DuplicateIdsFix.md
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