Move MissingRegistrationDataHandler to NavigationHandler
Summary: This differential solves the following Linear issue: https://linear.app/comm/issue/ENG-7967/navigation-error.
Test Plan:
- Repeat reproduction steps without this diff. Ensure error occurs.
- Repeat reproduction steps with this diff. Ensure everything works.
Reviewers: tomek, inka
Reviewed By: tomek
Subscribers: ashoat
Differential Revision: https://phab.comm.dev/D11781