Website Migrations Edit Form improvements

We've improved the Website Migrations Edit Form with several updates to make migrations smoother. The form now displays a "Recent" label to show which submission method you used last, automatically pre-fills the detected login URL so you don't have to re-enter it, and gives you the option to edit the login URL if it was detected incorrectly. You'll also see a reminder explaining how long migrations typically take and that domain changes should only be made after the migration completes. The Backup files section has been moved out from under WordPress settings into its own dedicated area, making it easier to find if you prefer to provide website files instead of login credentials.