Replace connectToWifi with ensureWifiConnected

connectToWifi expects a CONNECTIVITY_ACTION broadcast, which
may not be received if wifi is already connected.

There is already a separate test exercising the broadcast,
testToggleWifiConnectivityAction.

Bug: 283272115
Change-Id: I21a358fcb119878969eb898e15fea9da1af9a108
Test: TH

tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java

@@ -847,7 +847,7 @@ public class ConnectivityManagerTest {
         assumeTrue(mPackageManager.hasSystemFeature(FEATURE_WIFI));
         assumeTrue(mPackageManager.hasSystemFeature(FEATURE_TELEPHONY));
 
-        Network wifiNetwork = mCtsNetUtils.connectToWifi();
+        Network wifiNetwork = mCtsNetUtils.ensureWifiConnected();
         Network cellNetwork = mCtsNetUtils.connectToCell();
         // This server returns the requestor's IP address as the response body.
         URL url = new URL("http://google-ipv6test.appspot.com/ip.js?fmt=text");