Update Truncate lookbook previews with tooltip + link for accessibility

[liuliu-dev]

What are you trying to accomplish?

Updates the advanced_multiple_items and max_widths Truncate lookbook previews to wrap items in Primer::Beta::Link with Primer::Alpha::Tooltip, so the full content is accessible when truncated.

Screenshots

Integration

List the issues that this change affects.

Closes # (type the GitHub issue number after #)

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.

What approach did you choose and why?

Anything you want to highlight for special attention from reviewers?

Accessibility

• Fixes axe scan violation - This change fixes an existing axe scan violation.
• No new axe scan violation - This change does not introduce any new axe scan violations.
• New axe violation - This change introduces a new axe scan violation. Please describe why the violation cannot be resolved below.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Lookbook)
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge

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