r/aws_eks_cluster: Supports null compute_config.node_role_arn when disabling auto mode or built-in node pools

[lorengordon]

Description

Supports setting compute_config.node_role_arn to null when disabling auto mode or built-in node pools

Relations

Relates #40582 (Actually closes the issue, in my opinion.)

[github-actions]

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[github-actions]

✅ Thank you for correcting the previously detected issues! The maintainers appreciate your efforts to make the review process as smooth as possible.

[lorengordon]

I based the work on #41925. I'm not too sure how to write golang tests to account for the scenarios this is fixing. But I did manage to build the binary and test using a dev override, and can confirm it is working as intended. It does allow removing the built-in node pools and setting the node role arn to null, without replacing the cluster. And can also disable auto mode and null the node role arn without replacing the cluster.