[Battery] Use existing repository flows for new QS tiles.

Now that we've defined a BatteryRepository, we can update the new QS
tiles to use the repository instead of re-creating the battery flows.

Bug: 434194794
Flag: com.android.systemui.qs_new_tiles
Test: With flag enabled, verify battery saver tile still works
Test: atest BatterySaverTileDataInteractorTest
RotationLockTileDataInteractorTest

Change-Id: I39994bff70a2ee4812916e9f367d81d96fea4943