feat: Define instance types on launch template to avoid node group creation and deletion when changing instance_types value

[noony]

Description

Replace aws_eks_node_group.instance_types by aws_launch_template.instance_requirements.allowed_instance_types.

If possible i'll need your help to test it.

Motivation and Context

This will replace a node group creation, then old nodegroup deletion by a simple update of the launch template on the nodegroup

This is very useful because of this issue (redacted) and will prevent downtime for instance_types change use case.

Breaking Changes

No breaking change it allow the same as before, but it will also allow specifying more than before like :

instance_types = ["c5*", "c6*"]

aws documentation see AllowedInstanceTypes part

How Has This Been Tested?

• I have updated at least one of the examples/* to demonstrate and validate my change(s)
• I have tested and validated these changes using one or more of the provided examples/* projects

• I have executed pre-commit run -a on my pull request

[bryantbiggs]

1. Why would this solve the linked issue?
2. What do you use for autoscaling the nodes in your data plane?
3. What version of Kubernetes are you currently using?

[noony]

Sorry i just tested and node group is managing asg behind in order to set instance types and not launch templates. I'm closing.

[github-actions]

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