Re-enable additionalSecurityGroups for bastion LB

[h3poteto]

fix #17250

This feature is documented: https://github.com/kubernetes/kops/blob/v1.32.0/docs/bastion.md#additional-security-groups-to-elb
But it is not implemented.

Once this feature was added: #8921
However, this was removed: #14468

I guess

• At first, Classic load balancer was used as a bastion LB. So, we could use security groups for the bastion LB.
• When CLB was changed to NLB, this feature was removed. Because NLB didn't support security groups at that time.
• However, after that change, AWS started to support security groups for NLB: https://aws.amazon.com/jp/blogs/containers/network-load-balancers-now-support-security-groups/

So, I think we can re-enable this feature currently.

What do you think?
If we don't need this feature, I'm going to delete it from the document.

[k8s-ci-robot]

Hi @h3poteto. Thanks for your PR.

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[hakman]

/ok-to-test

[hakman]

Thanks @h3poteto, looks good to me as is.
/lgtm
/approve
/retest

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hakman

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[hakman]

/test pull-kops-e2e-k8s-gce-cilium
/test pull-kops-e2e-k8s-gce-ipalias

[hakman]

/override pull-kops-e2e-k8s-gce-ipalias

[k8s-ci-robot]

@hakman: Overrode contexts on behalf of hakman: pull-kops-e2e-k8s-gce-ipalias

In response to this:

/override pull-kops-e2e-k8s-gce-ipalias

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