chore: Add unregistered taint when nodes register

[engedaam]

Fixes #N/A

Description

• Add node registration taint in userData for custom AMIs. All nodes that are launched by Karpenter will need the karpenter.sh/unregistered taint. Karpenter requires this taint to consider a node to have registered with the cluster. By default, all AMIs that Karpenter provides userData will include the taint. However, for custom AMIs Karpenter does not add any userData on the nodes. Therefore, all custom AMIs will need to add userData that would have otherwise been automatically add by Karpenter: https://karpenter.sh/docs/concepts/nodeclasses/#custom
• The custom AMI test did not contain karpenter.sh/unregistered therefore our test was improperly considering the node not having registered

How was this change tested?

• /karpenter versionCompatibility

Does this change impact docs?

• Yes, PR includes docs updates
• Yes, issue opened: #
• No

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[engedaam]

/karpenter versionCompatibility

[coveralls]

Pull Request Test Coverage Report for Build 12875442938

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 64.986%

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Totals
Change from base Build 12841205415:	0.0%
Covered Lines:	5776
Relevant Lines:	8888

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💛 - Coveralls

[github-actions]

Snapshot successfully published to oci://021119463062.dkr.ecr.us-east-1.amazonaws.com/karpenter/snapshot/karpenter:0-8ffecc3083281009cdf9a64be6ba742b7346533b.
To install you must login to the ECR repo with an AWS account:

aws ecr get-login-password --region us-east-1 | docker login --username AWS --password-stdin 021119463062.dkr.ecr.us-east-1.amazonaws.com

helm upgrade --install karpenter oci://021119463062.dkr.ecr.us-east-1.amazonaws.com/karpenter/snapshot/karpenter --version "0-8ffecc3083281009cdf9a64be6ba742b7346533b" --namespace "kube-system" --create-namespace \
  --set "settings.clusterName=${CLUSTER_NAME}" \
  --set "settings.interruptionQueue=${CLUSTER_NAME}" \
  --set controller.resources.requests.cpu=1 \
  --set controller.resources.requests.memory=1Gi \
  --set controller.resources.limits.cpu=1 \
  --set controller.resources.limits.memory=1Gi \
  --wait

[jonathan-innis]

LGTM 🚀