Add action for low battery tip

The action should be same as EarlyWarningTip.
1. Option to "turn on battery saver" is battery is low
2. Or show "battery saver is on" and take user to "battery saver" page.

Fixes: 76113067
Test: RunSettingsRoboTests

Change-Id: I896358305a8ae4cd97c3864bbf6e556b4d025dd7