Add some tests for packet wakeup logging changes

Cellular networks are now supported for marking wakeup packets. As a
result onWakeupEvent now also reports data relevant to the cell
transport.

These unit tests should add coverage for these new behaviors.

Test: atest FrameworksNetTests

Bug: 276498460
Change-Id: I0b8a03fff6255e067b736f3dbfb53de56420f90b

service/src/com/android/server/ConnectivityService.java

@@ -7919,7 +7919,8 @@ public class ConnectivityService extends IConnectivityManager.Stub
         return captivePortalBuilder.build();
     }
 
-    private String makeNflogPrefix(String iface, long networkHandle) {
+    @VisibleForTesting
+    static String makeNflogPrefix(String iface, long networkHandle) {
         // This needs to be kept in sync and backwards compatible with the decoding logic in
         // NetdEventListenerService, which is non-mainline code.
         return SdkLevel.isAtLeastU() ? (networkHandle + ":" + iface) : ("iface:" + iface);