Previously, `exportSuccess_populatesEditingEndedEvent` and `exportError_populatesEditingEndedEvent` used an AtomicReference to capture the EditingEndedEvent. However, this led to a race condition where `EditingEndedEvent` was accessed before it was set in the `onMetricsReported` callback, resulting in a NullPointerException. This change replaces the AtomicReference with a SettableFuture to ensure the test waits for the event to be reported before asserting its value.
PiperOrigin-RevId: 739146511
5f7066a9d9