Move current user todos to new widget architecture

What does this MR do and why?

Refactors the current user todos widget services to use the new widget architecture / callback classes

Related to #368503 (closed)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.