Add function getBatteryHistorySinceLastFullCharge, used to replace

getBatteryHistory in BatteryHistoryLoader.

getBatteryHistory couldn't be changed directly as it needs to be kept
for other features.

Bug: 236101687
Test: make RunSettingsRoboTests
Change-Id: I3e3cdd3a0225228bf76f6750f6a56f031666720f