[native] Include additional fields in BuildInfo

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. What sort of user is/has logged in (eg isStaff/hasStaffUserLoggedIn)

We add the following fields to BuildInfo to make these accessible while the app is running:

• __DEV__
• isStaffRelease
• isCurrentUserStaff
• hasStaffUserLoggedIn

Might change styling a bit in later diff (replace true/false text w/ check or cross icon or something) but that's not critical

Test Plan:
Things look as expected:

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

Reviewed By: tomek, O2 Blocking Reviewers

Subscribers: ashoat, abosh

Differential Revision: https://phab.comm.dev/D5558