This CL adds a CTS test for Data Stall events to ConnectivityDiagnostics. This makes sure that new DataStall detection methods are passed to ConnectivityDiagnostics callbacks with the appropriate detection method bit mask. Bug: 156294356 Bug: 148032944 Test: atest ConnectivityDiagnosticsManagerTest Change-Id: Id6f1bff59b08192f09ebcc4578a3c233fd1c2768