fix: Karpenter 1.0 installation fails when using Bottlerocket

[JoeNorth]

Issue #249

Description of changes:
Adds lookups for Bottlerocket AMIs so that the EC2NodeClass is created correctly.

$ ./eksdemo install karpenter -c main-lab -a Bottlerocket --dry-run

apiVersion: karpenter.k8s.aws/v1
kind: EC2NodeClass
metadata:
  name: default
spec:
  amiFamily: Bottlerocket
  role: KarpenterNodeRole-main-lab
  subnetSelectorTerms:
    - tags:
        Name: eksctl-main-lab-cluster/SubnetPrivate*
  securityGroupSelectorTerms:
    - tags:
        aws:eks:cluster-name: main-lab
  tags:
    eksdemo.io/version: v0.16.0-29-g43b91f2-dev
  amiSelectorTerms:
    - id: ami-09a54b713b931a469
    - id: ami-0b07fdee374ab4cf3

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[aaroniscode]

Thank you @JoeNorth ! This is a great PR and thanks for fixing my spelling error! :)