[v14.x backport] child_process: queue pending messages
Backport of #41221
It fixes the problem of the child process not receiving messages.
Fixes: #41134 (closed)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Backport of #41221
It fixes the problem of the child process not receiving messages.
Fixes: #41134 (closed)