Fix nascent timer never get removed

By design, the nascent timer will be removed after a network
satisfied first request. However, this never happens.
Because the mInactive is false when that happens, so isNascent
is never true.

Furthermore, when removing a nascent timer, the inactivity
state can never be updated since no condition in the
updateInactivityState will be met to update the state correctly.

Thus, update inactive state accordingly when adding/removing the
nascent timer.

Test: TH
Bug: 184227264
Merged-In: I3c2563d4ae4e3715d0c6270344ba8f7ef067872f
Merged-In: I4c1521b6e0ef68ac489771a2ab6b09ef3e381577
Change-Id: I4c1521b6e0ef68ac489771a2ab6b09ef3e381577
  (cherry-picked from ag/14060609)

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

@@ -7851,6 +7851,7 @@ public class ConnectivityService extends IConnectivityManager.Stub
             // all networks except in the case of an underlying network for a VCN.
             if (newSatisfier.isNascent()) {
                 newSatisfier.unlingerRequest(NetworkRequest.REQUEST_ID_NONE);
+                newSatisfier.unsetInactive();
             }
 
             // if newSatisfier is not null, then newRequest may not be null.
@@ -8355,6 +8356,7 @@ public class ConnectivityService extends IConnectivityManager.Stub
             // But it will be removed as soon as the network satisfies a request for the first time.
             networkAgent.lingerRequest(NetworkRequest.REQUEST_ID_NONE,
                     SystemClock.elapsedRealtime(), mNascentDelayMs);
+            networkAgent.setInactive();
 
             // Consider network even though it is not yet validated.
             rematchAllNetworksAndRequests();