[lib] Add MemberInfoSansPermissions support to threadOtherMembers
Summary:
This resolves a flow issue when RawThreadInfo.members are of type MemberInfoSansPermissions.
Depends on D12315
Test Plan: NA, flow issue later in stack is resolved.
Reviewers: ashoat, ginsu, tomek
Reviewed By: ginsu
Differential Revision: https://phab.comm.dev/D12321