Revert "Diable ConnectivityManagerTest#testFactoryReset"

This reverts commit f866acb6e7173b28b065b1c0d1e99738d17ddc6e.

Reason for revert: enable the test

Change-Id: I00c2b32f0bf6fdb825d0edba8dcb74bcc7ad2fbf
diff --git a/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java b/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
index a0508e1..ade89c0 100644
--- a/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
+++ b/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
@@ -2560,10 +2560,9 @@
         assertThrows(SecurityException.class, () -> mCm.factoryReset());
     }
 
-    // @AppModeFull(reason = "Cannot get WifiManager in instant app mode")
-    // @Test
-    // Temporarily disable the unreliable test, which is blocked by b/254183718.
-    private void testFactoryReset() throws Exception {
+    @AppModeFull(reason = "Cannot get WifiManager in instant app mode")
+    @Test
+    public void testFactoryReset() throws Exception {
         assumeTrue(TestUtils.shouldTestSApis());
 
         // Store current settings.