dataconnect: fix flaky test: collect_gets_notified_of_per_data_deserializer_successes#7210

dconeybe merged 2 commits intomainfirebase/firebase-android-sdk:mainfrom

dconeybe/dataconnect/CollectGetsNotifiedFlakyTestFixfirebase/firebase-android-sdk:dconeybe/dataconnect/CollectGetsNotifiedFlakyTestFixCopy head branch name to clipboard