Fix envoy, gateway, and quickstart pd-model images

[dczhu]

Pull Request Description

Currently envoy and gateway are pointing to envoyproxy namespace. They should be under aibrix ns.

The quickstart pd-model image is referring to a non-existent image. Update with correct version.

Related Issues

Resolves: #[Insert issue number(s)]

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[gemini-code-assist[bot]]

Summary of Changes

Hello @dczhu, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue where the Envoy and Gateway container images were incorrectly referencing the envoyproxy namespace. The changes ensure that both components now correctly point to the aibrix namespace for their respective images, aligning the deployment configuration with the intended image registry source.

Highlights

• Envoy Image Path Correction: The image path for the 'envoy' container has been updated from the 'envoyproxy' namespace to the 'aibrix' namespace within the vke.yaml configuration.
• Gateway Image Path Correction: The image path for the 'shutdownManager' (gateway) container has been updated from the 'envoyproxy' namespace to the 'aibrix' namespace within the vke.yaml configuration.

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