[EKS] [request]: Return list-updates in reversed chronological order

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**Tell us about your request**
When requesting a list-updates the updates are returned in random order. The only way to figure out what the latest update is, is to do a list-update and then a describe-update of every update found and comparing all submission times. This becomes more cumbersome the longer the update history is.

Please return the updates in reversed chronological order

**Which service(s) is this request for?**
EKS

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
Figure out if the latest update failed.

**Are you currently working around this issue?**
list -> loop -> compare.

Review the EKS list-updates and describe-update operations, focusing on how update submission times are exposed and ordered. Done means list-updates returns updates in reversed chronological order so the latest update can be identified without describing every result.

Written by the indexing model from the issue text.