Add link to Post navigation block arrow icon

[karthick-murugan]

What?

Fixes #66040

Why?

This PR adds link to Post navigation block previous and next arrow icons

How?

Added the links to the arrows icons of Post navigation block

Testing Instructions

1. Activate the Twenty-Twenty Five theme.
2. Insert the Post Navigation block pattern in the Site Editor.
3. Ensure the Next Post and Previous Post blocks are added.
4. Open a single post on the frontend.
5. Verify the navigation arrow icons are clickable and navigate to the same adjacent post.

Screenshots or screencast

Before

After

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Co-authored-by: karthick-murugan <[email protected]>
Co-authored-by: AnmolVerma404 <[email protected]>
Co-authored-by: ariful93 <[email protected]>

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