test: fix flaky test-cluster-shared-leak
Wait for worker2 to come online before doing anything that might result in an EPIPE. Fixes flakiness of test on Windows.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Wait for worker2 to come online before doing anything that might result in an EPIPE. Fixes flakiness of test on Windows.