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