Consolidate EKS update waiter function

[gdavison]

The EKS service has a central function, DescribeUpdate (or DescribeUpdateWithContext) to track updates to clusters, add-ons, and node groups. This can use a centralized waiter function, but is currently implemented separately for each resource.

The PR #16972 adds the waiter function EksAddonUpdateSuccessful. This can be adapted for clusters and node groups.

Affected Resource

• aws_eks_cluster
• aws_eks_node_group

[ewbankkit]

Because each call to DescribeUpdate is slightly different (NodegroupName must be passed for node group updates, AddonName must be passed for add-on updates, etc.), attempting to centralize the waiter will lead to more complex code.

[github-actions]

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