feat: allow author of page with write:pages permission to delete the page they created

[ViniciusCestarii]

This PR enhances the page deletion logic to support ownership-based access control in addition to role-based permissions.

• Allows users to delete a page if they are the original author and have write:pages permission for that page's locale/path.
• Users with explicit delete:pages permission for the page still retain full deletion rights.

Why

This change supports a more intuitive and flexible permission model:

• Empowers content authors to manage (delete) their own work without requiring broader delete permissions.