Add test for ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS intent.

Add a verifier test to ensure there's a user affordance that is shown in
response to the ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS intent that
allows the user to disable battery optimizations for a specific app.

Bug: 173547576
Test: install on device and manually check activities
Change-Id: I9464ece39b9f632f9458047617e321c8774e91a1