Add tron metric logging

- one tracking id for every picker type

Bug: 73952488
Test: m RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.datetime.timezone
Change-Id: Ia487f1657d6ed1f0fb40b61f39f4a47c38bd6179

src/com/android/settings/datetime/timezone/BaseTimeZonePicker.java

@@ -146,12 +146,6 @@ public abstract class BaseTimeZonePicker extends InstrumentedFragment
         return false;
     }
 
-    @Override
-    public int getMetricsCategory() {
-        // TODO: use a new metrics id?
-        return MetricsEvent.ZONE_PICKER;
-    }
-
     public interface OnListItemClickListener {
         void onListItemClick(int position);
     }