[native] Introduce LoggedOutStaffInfo and display in LoggedOutModal

Summary:
In order to potentially help with troubleshooting, it's helpful to know

A. What sort of build is running (eg staff release/__DEV__)
B. Whether a staff user has logged in (hasStaffUserLoggedIn)

We display the following fields in LoggedOutStaffInfo:

• __DEV__
• isStaffRelease
• hasStaffUserLoggedIn

Test Plan:
Looks as expected:

Reviewers: tomek, marcin, varun, ginsu, rohan, O2 Blocking Reviewers, ashoat

Reviewed By: O2 Blocking Reviewers, ashoat

Subscribers: ashoat, abosh

Differential Revision: https://phab.comm.dev/D5559