pkubicsek-sb

[FEATURE] Extend Elasticache support with serverless version

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### Is there an existing issue for this? - [X] I have searched the existing issues ### Feature description AWS recently announced GA for their [serverless version](https://aws.amazon.com/about-aws/whats-new/2023/11/amazon-elasticache-serverless/) of Elasticache service...

HasHighlyAvailableControlPlane incorrectly uses filtered instance groups

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# Issue: HasHighlyAvailableControlPlane incorrectly uses filtered instance groups /kind bug ## 1. What `kops` version are you running? ``` kops version 1.33.0 ``` ## 2. What Kubernetes version are you...

Fix HasHighlyAvailableControlPlane to use AllInstanceGroups

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**What this PR does / why we need it**: Fixes a bug where `HasHighlyAvailableControlPlane()` incorrectly uses the filtered `InstanceGroups` list instead of `AllInstanceGroups`. This causes cluster-wide controllers (aws-load-balancer-controller, node-termination-handler, etc.)...