[lib] Update hasPermission to check KNOW_OF

Summary:
Context in this diff: https://phab.comm.dev/D9841

Depends on D9843

Test Plan: Introduced test case where hasPermission should've failed, and now does fail.

Reviewers: ashoat, ginsu, tomek, rohan

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D9844