Feat: Navigate to editing different pages within the editor.

[dhananjaykuber]

Fixes #56376

What?

Added an "Edit Post/Page" button in the link preview panel that allows direct navigation to the edit screen of linked posts.

Why?

Users need an easier way to edit linked posts/pages directly from the editor instead of searching through admin.

How?

1. Added new button with commentEditLink icon in the link preview panel
2. Created getEditUrl function to generate WordPress admin edit URL using post ID
3. Added handleEditClick function to handle navigation

Testing Instructions

1. Create/open a post in editor
2. Add a link to another post/page
3. Click link to open link preview panel
4. Click "Edit Post/Page" button

Screencast

screen-capture.8.webm

[github-actions]

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Co-authored-by: dhananjaykuber <dhananjaykuber@git.wordpress.org>
Co-authored-by: scruffian <scruffian@git.wordpress.org>

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