Sync before checking logs

The events are logged on a different threads. We should wait until all logs
are processed before verifying expectations.

PiperOrigin-RevId: 547926810

connections/implementation/analytics/analytics_recorder_test.cc

@@ -977,6 +977,7 @@ TEST(AnalyticsRecorderTest, StartListeningForIncomingConnectionsWorks) {
           >
         >)pb");
 
+  analytics_recorder.Sync();
   EXPECT_THAT(event_logger.GetLoggedClientSession(),
               Partially(EqualsProto(strategy_session_proto)));
 }