Remove foreground_service_usage_time_in_ms field which has been merged
into background_usage_time_in_ms in the BatteryUsageStats (b/257392992).

Test: make RunSettingsRoboTests + manual
Bug: 258124768
Bug: 253553141
Change-Id: I0967eec0cbe6d0cb7a0535d744a1046dec1d267b
16 files changed