Preserve index.php in wp-content during import

[wojtekn]

Related issues

• Fixes index.php file is removed from wp-content during the import #1047

Proposed Changes

I propose to add index.php to the protected files list during site import. Previously, the moveExistingWpContentToTrash method was removing index.php from the wp-content directory, which is a required WordPress file. The fix ensures this file is preserved alongside other critical files like db.php and the mu-plugins directory.

Testing Instructions

1. Create a new WordPress site in Studio
2. Verify that wp-content/index.php exists in the new site
3. Export this site as a backup file
4. Create another new WordPress site in Studio
5. Import the backup file into the second site
6. Verify that wp-content/index.php still exists after the import
7. The site should work normally without any file-related errors

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[ivan-ottinger]

The proposed change looks good and works as expected. The wp-content/index.php stays in place after import. 👍🏼