Many features are using the enhanced estimates but the copy for them
has gotten out of sync. This CL moves shared strings between Settings
and SysUI to SettingsLib and also updates features that use the
strings to have consistent behavior/text.
Test: Robotests
Bug: 65656091
Bug: 66909350
Bug: 67469159
Change-Id: Ie5ef1ed65429ca9805cff374f1439e5d61eb6591
Create PowerUsageSummaryLegacy and power_usage_summary_legacy, which
contains the old implementaion.
Bug: 69797586
Test: RunSettingsRoboTests
Change-Id: Icb9c25f06889462a6eedea48ae166043a6636848