Resolve "Use the v4 API from the frontend"
What does this MR do?
- Replace v3 with v4 API on the frontend
Why was this MR needed?
- v3 API is deprecated as of 9.0 release
What are the relevant issue numbers?
Closes #1849 (closed)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Closes #1849 (closed)