[native] Consume useAvailableThreadMemberActions in native/ThreadSettingsMember

Summary:
Similar to D11913, but for ThreadSettingsMember.

This was last usage of getAvailbleThreadMemberAction, so we also go ahead and remove it.

Depends on D11913

Test Plan:
flow + close reading for now

Logged value of getAvailbleThreadMemberAction and useAvailableThreadMemberActions and ensured value was the same. Assuming the logic in ThreadSettingsMember that works with value is and remains correct.

Reviewers: ashoat, ginsu, tomek, varun, will

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D11914