Change extract_images.sh to include Model Registry

[rimolive]

Pull Request Template for Kubeflow manifests Issues

✏️ A brief description of the changes

Included in hack/extract_images.sh script the Model Registry images.

📦 List any dependencies that are required for this change

N/A

🐛 If this PR is related to an issue, please put the link of the issue here.

N/A

✅ Unit Test Checklist

• 🛠️ Make sure you have installed kustomize == 5.2.1+
• ✍️ Have you written new tests for your core changes, as applicable?
• 🔄 Have you successfully run existing tests with your changes ?
• 🚀 Have you successfully run existing and new tests with your changes ?

✅ Contributor checklist

• All the commits have been signed-off (To pass the DCO check)
• Submit the Contributor License Agreements (To pass the cla/google check)

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[juliusvonkohout]

/approve

[juliusvonkohout]

/lgtm

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