[Provider Model] Move the Internet unavailable Wi-Fi down

- Check the Wifi network have both INTERNET and VALIDATED capabilities
to achieve effective network access

- Move the Internet unavailable Wi-Fi down to the top of Wi-Fi list

- Don't paint color for the Internet unavailable Wi-Fi

- Screenshot:
  https://screenshot.googleplex.com/w82kbALssdTZmg4

Bug: 178457619
Bug: 178926547
Bug: 178978070
Test: manual test on device
atest -c InternetUpdaterTest \
         NetworkProviderWorkerTest \
         ProviderModelSliceTest

Change-Id: Idf04e556ab5a87abc5bc96d1934f5e8fd91fbfaa

src/com/android/settings/wifi/slice/WifiSlice.java

@@ -164,7 +164,7 @@ public class WifiSlice implements CustomSliceable {
         return rowBuilder;
     }
 
-    private IconCompat getWifiSliceItemLevelIcon(WifiSliceItem wifiSliceItem) {
+    protected IconCompat getWifiSliceItemLevelIcon(WifiSliceItem wifiSliceItem) {
         final @ColorInt int tint;
         if (wifiSliceItem.getConnectedState() == WifiEntry.CONNECTED_STATE_CONNECTED) {
             tint = Utils.getColorAccentDefaultColor(mContext);