[Wi-Fi] Replace WifiTracker with WifiTracker2 for SavedAccessPointsWifiSettings2

Use SavedNetworkTracker instead of WifiTracker, it provides Wi-Fi signal information
for saved networks. This is the main UX difference of this change.

Bug: 144543677
Test: make RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.wifi.
Change-Id: I546ad08ffd2f6f736023cb1f3e1cb344a5842e14

src/com/android/settings/wifi/savedaccesspoints2/SubscribedAccessPointsPreferenceController2.java

@@ -18,10 +18,6 @@ package com.android.settings.wifi.savedaccesspoints2;
 
 import android.content.Context;
 
-import com.android.settingslib.wifi.WifiSavedConfigUtils;
-
-import java.util.stream.Collectors;
-
 /**
  * Controller that manages a PreferenceGroup, which contains a list of subscribed access points.
  */
@@ -31,12 +27,4 @@ public class SubscribedAccessPointsPreferenceController2 extends
     public SubscribedAccessPointsPreferenceController2(Context context, String preferenceKey) {
         super(context, preferenceKey);
     }
-
-    @Override
-    protected void refreshSavedAccessPoints() {
-        mAccessPoints = WifiSavedConfigUtils.getAllConfigs(mContext, mWifiManager).stream()
-                .filter(accessPoint -> accessPoint.isPasspointConfig())
-                .sorted(SavedNetworkComparator2.INSTANCE)
-                .collect(Collectors.toList());
-    }
 }