model‑registry: add kubectl apply example for installation (#1071)

[Saketh1702]

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Description of your changes:

This adds a “kubectl apply” snippet (and optional Istio compatibility) to the Model Registry installation docs.

Fixes kubeflow/model-registry#1071

Issue

Closes: kubeflow/model-registry#1071

Labels

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[google-oss-prow]

Hi @Saketh1702. Thanks for your PR.

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[google-oss-prow]

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[Arhell]

/ok-to-test