Add support for outpost nodegroups to `make cluster/create`

[ConnorJC3]

Is this a bug fix or adding new feature?

New feature for Maklefile

What is this PR about? / Why do we need it?

Adds the ability to create an outposts nodegroup when creating an eksctl cluster through make cluster/create, which greatly simplifies debugging outpost-only features of the driver.

What testing is done?

Manually tested with:

export CLUSTER_TYPE=eksctl
export AWS_REGION=us-east-1
export AWS_AVAILABILITY_ZONES=us-east-1a,us-east-1b
export OUTPOST_ARN="arn:aws:outposts:us-east-1:REDACTED:outpost/op-REDACTED"
export OUTPOST_INSTANCE_TYPE=c5.xlarge

make cluster/create

[ElijahQuinones]

Looks good to me tested these changes to the make file on teams outpost account and they worked for me as well.

/lgtm

[k8s-ci-robot]

@ElijahQuinones: changing LGTM is restricted to collaborators

In response to [this](https://github.com/kubernetes-sigs/aws-ebs-csi-driver/pull/2135#issuecomment-2338670209): >Looks good to me tested these changes to the make file on teams outpost account and they worked for me as well. > >/lgtm Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[AndrewSirenko]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AndrewSirenko

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