feat: resolve images from nodepool template

[jwcesign]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

testing result:

spec:
  imageSelectorTerms:
  - alias: Ubuntu
status:
  conditions:
  - lastTransitionTime: "2025-03-02T09:07:00Z"
    message: ""
    observedGeneration: 2
    reason: ImagesReady
    status: "True"
    type: ImagesReady
  - lastTransitionTime: "2025-03-02T09:07:00Z"
    message: ""
    observedGeneration: 2
    reason: Ready
    status: "True"
    type: Ready
  images:
  - requirements:
    - key: kubernetes.io/arch
      operator: In
      values:
      - arm64
    - key: karpenter.k8s.gcp/instance-gpu-count
      operator: DoesNotExist
    sourceImage: projects/ubuntu-os-gke-cloud/global/images/ubuntu-gke-2204-1-31-arm64-20250128
  - requirements:
    - key: kubernetes.io/arch
      operator: In
      values:
      - amd64
    sourceImage: projects/ubuntu-os-gke-cloud/global/images/ubuntu-gke-2204-1-31-v20250128

karpenter will create two gke nodepool template and resolve the images from it's derived instance template

Does this PR introduce a user-facing change?