Sporadic failure on test_permission_request_notifications_flow_for_manual_review

[chrisvanrun]

See run: https://github.com/comic/grand-challenge.org/actions/runs/11909994990/job/33188499636

I think it is quickly fixable by ordering the notifications.

[jmsmkn]

Quick fix: you can mark the test as flaky using @pytest.mark.flaky(reruns=3). Proper fix: rewrite the test so that it is not dependent on the ordering of Notifications.