URL to access package schema is offline

### Operating System

Windows

### Version Information

I'm trying to package a model with the `az model package` command, but the URL that provides the package schema is currently offline.

The URL in question: http://azureml/sdk-2-0/ModelVersionPackage.json

Reference to the docs - https://learn.microsoft.com/en-us/azure/machine-learning/how-to-package-models?view=azureml-api-2&tabs=cli

### Steps to reproduce

1. Access http://azureml/sdk-2-0/ModelVersionPackage.json
2. Verify it's offline, no package deployment via CLI should work as a result.

### Expected behavior

A json being returned.

### Actual behavior

The page can't be reached.

### Addition information

_No response_

Start by reproducing the failure at http://azureml/sdk-2-0/ModelVersionPackage.json and reviewing the linked model-packaging documentation. Trace how the `az model package` command obtains this schema and determine which project or service owns the unavailable URL. Done means the endpoint returns the expected JSON and package deployment works through the documented CLI flow.

Written by the indexing model from the issue text.