flex karpenter node-pool configurations

[myaser]

• make the instanceType column non mandatory for karpenter pools
• parse a node pool config item "requirements" to allow injecting granular karpenter pool requirements example:

  - config_items:
    taints: nvidia.com/gpu=present:NoSchedule
    requirements: |
      - key: karpenter.k8s.aws/instance-gpu-manufacturer
        operator: In
        values: 
          - nvidia
  discount_strategy: null
  instance_types: null
  max_size: null
  min_size: null
  name: karpenter-gpu
  profile: worker-karpenter

related to https://github.com/zalando-incubator/kubernetes-on-aws/pull/7617

[demonCoder95]

👍

[myaser]

👍🏻