[9.x] Backport 18513, 18694
9.x backport of #18513, #18694.
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
async_hooks
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
9.x backport of #18513, #18694.
make -j4 test
(UNIX), or vcbuild test
(Windows) passesasync_hooks