[identity] Force v1 primary logout for authoritative keyserver owner

Summary:
Address ENG-10013.

Depends on D14172

Test Plan:

• Mocked AUTHORITATIVE_KEYSERVER_OWNER_USER_ID to be my user ID.
• Logged in a keyserver
• On a mobile device, performed primary device logout.
• Verified that keyserver wasn't logged out, DDB contains unsigned device list, and backup was removed

Reviewers: kamil

Reviewed By: kamil

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D14173