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:

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

/lgtm

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[AndrewSirenko]

One recommendation, otherwise looks great! Thanks for this.

[torredil]

/lgtm

[AndrewSirenko]

/approve

[k8s-ci-robot]

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