test(watch-tool): deflake TestRetryWatcherToFinishWithUnreadEvents
test(watch-tool): deflake TestRetryWatcherToFinishWithUnreadEvents

Signed-off-by: knight42 <anonymousknight96@gmail.com>

Kubernetes-commit: 1d92314f262548b6b24e309943274e0d9d196a41

li-ang/client-go,kubernetes/client-go