feat: disable ASG AZRebalance of EKS by default

[maxsxu]

Motivation

By default AWS rebalance the auto-scaling groups when there are are more nodes in one zone than the other. For Kubernetes clusters where there is already a Cluster Autoscaler operating the AutoScalingGroup (ASG) it could have some undesired effects.

Example there is an unbalanced ASG, but cluster autoscaler removes a node in the zone or add a new node in the unbalanced zone (which will balance again the number of machines), it can result in the two mechanisms take corrective actions at the same time provoking an unexpected result.

Ideally, we have only one controller that decides when to expand or shrink the node pool.

Modifications

• Suspend AZRebalance via terraform_data resource

Verifying this change

• Make sure that the change passes the CI checks.

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This change is a trivial rework / code cleanup without any test coverage.

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This change added tests and can be verified as follows:

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• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

Documentation

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References

Currently, AWS doesn't support manipulate the ASGs implicitly created by EKS managed Node Groups. There are some related discussions:

• [EKS] [request]: EKS managed node group support for ASG target group aws/containers-roadmap#709
• [EKS] [request]: Nodegroup should support tagging ASGs aws/containers-roadmap#608
• [EKS] [request]: Support tagging underlying ASGs of node groups aws/containers-roadmap#1541
• Autoscaling group rebalancing kubernetes/kops#3319
• managed_node_group submodule suspending processes terraform-aws-modules/terraform-aws-eks#2195
• Tags are not propagated from EKS managed node group to auto-scaling groups terraform-aws-modules/terraform-aws-eks#1886
• Tags are not propagated on nodegroup ASG terraform-aws-modules/terraform-aws-eks#860
• Add Tags to ASG when using node groups terraform-aws-modules/terraform-aws-eks#1558
• New resource aws_autoscaling_group_tag hashicorp/terraform-provider-aws#20674

[github-actions]

@maxsxu:Thanks for your contribution. For this PR, do we need to update docs?
(The PR template contains info about doc, which helps others know more about the changes. Can you provide doc-related info in this and future PR descriptions? Thanks)

[github-actions]

@maxsxu:Thanks for providing doc info!