Change NavList's 'show more' example to be more representative of what we do in prod

[camertron]

What are you trying to accomplish?

We're currently creating an instance of OpenStruct to render async NavList items, which is not how we do it in prod. This PR updates PVC with a more realistic example.

Integration

No changes necessary in production.

Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

Accessibility

• No new axe scan violation - This change does not introduce any new axe scan violations.

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Latest commit: 2eaace0

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