Produce and Sort List of Instances to be Updated

[webern]

trafficstars

• [x] List container instances in the cluster that are running Bottlerocket. (https://github.com/bottlerocket-os/bottlerocket-ecs-updater/issues/5)
• [x] Keep only those that need a Bottlerocket update. (Checking this can be done in parallel.) (also https://github.com/bottlerocket-os/bottlerocket-ecs-updater/issues/5)
• [x] Eliminate those that host non-service tasks. (https://github.com/bottlerocket-os/bottlerocket-ecs-updater/issues/8)
• [ ] Sort the list by current version ascending, seed ascending

[samuelkarp]

The first three checkboxes above are covered by other issues. The last one is one that we should do, but doesn't need to be done first.

[webern]

In fact this sort seems extremely low priority to me.