[Provider model] Add "Turn off/on Wi-Fi" link to Internet Panel

- Replace the left menu button with "Turn off/on Wi-Fi"
  - Remove the TurnOnWifiSlice

- Show "Wi-Fi is off" sub-title when Wi-Fi is disabled
  - Remove the "Wi\u-Fi is turned on" sub-title when APM is on.

Bug: 188710392
Test: manual test
atest -c InternetConnectivityPanelTest
make RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.panel

Change-Id: I53e200f6cadf8b712bf794bcbd5ff79f0f239cc0

src/com/android/settings/panel/PanelFragment.java

@@ -491,11 +491,11 @@ public class PanelFragment extends Fragment {
             mPanelClosedKey = PanelClosedKeys.KEY_SEE_MORE;
             final FragmentActivity activity = getActivity();
             if (mPanel.isCustomizedButtonUsed()) {
-                mPanel.onClickCustomizedButton();
+                mPanel.onClickCustomizedButton(activity);
             } else {
                 activity.startActivityForResult(mPanel.getSeeMoreIntent(), 0);
+                activity.finish();
             }
-            activity.finish();
         };
     }