Remove some default CPU limits

[jim-barber-he]

Remove the default CPU limits defined for the aws-iam-authentication and node-problem-detector DaemonSets.

This makes them behave the same as the other cpuLimit parameters for the cluster that also do not have defaults.

As it was previously set up, if an administrator does not want CPU limits defined for these DaemonSets, there was no way to define that via the cluster spec.

[k8s-ci-robot]

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[jim-barber-he]

I wrote this after talking about it a bit in Slack.
https://kubernetes.slack.com/archives/C3QUFP0QM/p1737422987782349

I don't know if the kOps maintainers are happy with applying this change or not, but I hope that they are.