chore: Added missing FollowDetail to TopNavigationProps.Identity.onFo…

[IgniparousTempest]

Description

The typing was incomplete for the TopNavigationProps.Identity.onFollow, which caused my IDE to complain that the href in the following is invalid:

<TopNavigation
        identity={{
            onFollow: (event) => {
                event.preventDefault();
                navigate(event.detail.href);
            },
            href: '/',
            title: 'title',
            logo: { src: logo, alt: 'ogo' }
        }}
/>

Related links, issue #, if available: n/a

How has this been tested?

1. Include this branch in your workspace.
2. Copy the above code into your project
3. The href now has a type.

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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