Update power_anomaly_event proto fields

- add enum PowerAnomalyType/PowerAnomalyKey
- update the func to get anomaly index

Test: manual
Bug: 291689623
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:356be9109080bc54232ff801b739ec10cab4fdfa)
Change-Id: If4e6684c8169dfa3edd4e18a11d518737a3b2840

tests/robotests/src/com/android/settings/fuelgauge/batteryusage/BatteryTipsControllerTest.java

@@ -16,8 +16,6 @@
 
 package com.android.settings.fuelgauge.batteryusage;
 
-import static com.google.common.truth.Truth.assertThat;
-
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
@@ -68,21 +66,6 @@ public final class BatteryTipsControllerTest {
         mBatteryTipsController.mPowerUsageFeatureProvider = mPowerUsageFeatureProvider;
     }
 
-    @Test
-    public void parsePowerAnomalyKey_preDefinedKeys_returnTrue() {
-        final String[] keys = {"adaptive_brightness", "screen_timeout"};
-        for (int index = 0; index < keys.length; index++) {
-            assertThat(mBatteryTipsController.getPowerAnomalyEventIndex(keys[index]))
-                    .isEqualTo(index);
-        }
-    }
-
-    @Test
-    public void parsePowerAnomalyKey_unknownKey_returnTrue() {
-        final String key = "unknown_key_for_test";
-        assertThat(mBatteryTipsController.getPowerAnomalyEventIndex(key)).isEqualTo(-1);
-    }
-
     @Test
     public void handleBatteryTipsCardUpdated_null_hidePreference() {
         mBatteryTipsController.handleBatteryTipsCardUpdated(/* powerAnomalyEvents= */ null);