[NUC-233] Ensure the call to setShardSequenceNumberInPersistency fails for non-existing or non-shard objects.

[alxtkr77]

No description provided.

[assaf758]

Notice that I updated the PR since Condition: "__obj_type == 3" was already in the codebase.
The PR Looks good but regarding checkShardExists (from previous PR) - do we still need it for debugging? I'm asking since I understand from your comment in the jira that nuclio will get 400 if there is update-item before put-record.
If we do need it, I suggest optimizing by maintaining a doCheckShardExist flag in the streamConsumerGroup such that the get-item check will continue until the first time the item was found to exist.