[native] Select logout flow basing on being primary device

Summary:
Address ENG-8550.

• Merged two dev "new flow logout" buttons into one
• Added new selector to get primary device

Test Plan:

• Created a user, logged in on two mobile devices
• Confirmed that pressing the button on secondary logs out only itself (secondary device logout)
• Confirmed that pressing the button on the primary logs out both (primary device logout)

Reviewers: kamil, varun, ashoat

Reviewed By: ashoat

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D13044