The sample_create_client.py feels like it fits to the shape of the original Beta 1 sample. Please consider making the following updates:

• Refer to ContainerRepository as something other than client here and here
• Since ContainerRepository isn't a client, we shouldn't be able to create an instance of it directly as we do here, unless this is a Python-specific requirement.
• In the proposed Beta3 API, we're not exposing functionality to list tags on a repository directly as we do here.
• If you'd like to illustrate the use of ContainerRepository in this sample, consider also including an illustration of ArtifactRegistry, as it is another Helper type that makes service calls.