Cancel state override request when app goes into background

Automatically cancel the state override request when the requesting app
goes into background or the screen is turned off.

Bug: 264557324
Test: Manually tested with the demo app.
atest com.android.server.devicestate.DeviceStateManagerServiceTest

Change-Id: I9d3208475d2a6231cde1d80f6886391e4f01cae2