test_runner: fix test counting
Fixes: https://github.com/nodejs/node/issues/47696
this also improves the test for https://github.com/nodejs/node/pull/46577
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Fixes: https://github.com/nodejs/node/issues/47696
this also improves the test for https://github.com/nodejs/node/pull/46577