Geo Sites - Update API Paths

What does this MR do and why?

Resolves #411486 (closed)

We have deprecated and renamed the Geo Sites URL from geo_nodes => geo_sites as part of #369140. Naturally, due to our v4 API version we support both concurrently. However, now that the API is fully functional we should update our codebase to use the non-deprecated one.

This change updates the API file to call the correct API and validates all functionality remains.

Screenshots or screen recordings

Before	After (No Change)

How to set up and validate locally

Setup Geo (optional)

Important: To properly test Geo you will need a separate GDK setup. Setup is straightforward but takes some time. Another option is to validate the code functionally and if needed schedule a call to sync and I can screen share my instance.

1. Ensure no other GDKs are running. gdk stop/gdk kill
2. Open an empty directory and install and run Geo with the one-line command found on the Easy installation instructions
3. Access your primary and secondary Geo instances via 127.0.0.1:3000 and 127.0.0.1:3001.

Testing

1. Access your primary GDK Geo Page (127.0.0.1:3000/admin/geo)
2. Ensure page loads and that network tab is routing the API requests to geo_sites URL.

Related to #411486 (closed)