Restore ConnectivityManagerTest into presubmits

These tests are no longer flaky.

Test: the dashboard shows no failure over the last 2 weeks
Bug: 292173706
Bug: 292174832
Change-Id: I2269596fd62328c54fff21238379d518d5bbd0cc
diff --git a/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java b/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
index e978664..32e4c34 100644
--- a/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
+++ b/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
@@ -1127,7 +1127,6 @@
      */
     @AppModeFull(reason = "Cannot get WifiManager in instant app mode")
     @Test
-    @SkipMainlinePresubmit(reason = "Out of SLO flakiness")
     public void testRegisterNetworkCallback_withPendingIntent() {
         assumeTrue(mPackageManager.hasSystemFeature(FEATURE_WIFI));
 
@@ -1271,7 +1270,6 @@
 
     @AppModeFull(reason = "Cannot get WifiManager in instant app mode")
     @Test
-    @SkipMainlinePresubmit(reason = "Out of SLO flakiness")
     public void testRegisterNetworkRequest_identicalPendingIntents() throws Exception {
         runIdenticalPendingIntentsRequestTest(false /* useListen */);
     }