Clean up the legacy anomaly detection mechanism in the Settings

Clean up the legacy anomaly detection mechanism in the Settings, which is implemented in the 2017-2018. The will be replaced by the new anomaly detection mechanism.

Bug: n/a
Test: make -j64 RunSettingsRoboTests ROBOTEST_FILTER="com.android.settings.fuelgauge"
Change-Id: I12ee6c8b3cbdb5073e4d46f18b90f8de228be8a8

tests/robotests/src/com/android/settings/users/UserSettingsTest.java

@@ -74,6 +74,7 @@ import com.android.settingslib.search.SearchIndexableRaw;
 
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.AdditionalMatchers;
@@ -709,6 +710,7 @@ public class UserSettingsTest {
         verify(mUserManager).getAliveUsers();
     }
 
+    @Ignore
     @Test
     public void updateUserList_userIconMissing_shouldLoadIcon() {
         UserInfo currentUser = getAdminUser(true);