chore(A11yHaTS): Rename Accessibility Notification Constants

The class now provides broadcast actions for scheduling and canceling
accessibility survey notifications. Its name should be updated to
better reflect this new functionality.

Bug: 379748766
Bug: 380346799
Test: atest AccessibilitySurveyNotificationJobServiceTest
            SurveyNotificationReceiverTest
            NotificationHelperTest
Flag: com.android.server.accessibility.enable_low_vision_hats
Change-Id: I271c497efe46c21c6a40e63c73576fddf5959341