Enable useSessionIdToScheduleMdnsTask

In case that the task is not canceled successfully, use session ID to
check if this task should continue to schedule more.

Bug: 285260665
Test: atest CtsNetTest FrameworksNetTests
Change-Id: Ic953ae781449a7ebf943999c8c8d3040a97641d9

tests/unit/java/com/android/server/connectivity/mdns/MdnsServiceTypeClientTests.java

@@ -379,9 +379,7 @@ public class MdnsServiceTypeClientTests {
     }
 
     @Test
-    @Ignore("MdnsConfigs is not configurable currently.")
     public void testIfPreviousTaskIsCanceledWhenNewSessionStarts() {
-        //MdnsConfigsFlagsImpl.useSessionIdToScheduleMdnsTask.override(true);
         MdnsSearchOptions searchOptions =
                 MdnsSearchOptions.newBuilder().addSubtype("12345").setIsPassiveMode(true).build();
         client.startSendAndReceive(mockListenerOne, searchOptions);