Inform Assistant visible activity when the stage of activity lifecycle is invoked.

By the original design, we register the activity event in the
ActivityManagerService. After getting the activity event, we will
query current visible activities and report them to Assistant.
Assistant will start to get direct actions of those visible
activities. But sometimes they can not get the direct actions
due to the stage of activity lifecycle before onStart().

We change the logic to make sure that the stage of visible
activity that we reported to the Assistant is after onStart().

Bug: 235296082
Test: atest VoiceInteractionSessionVisibleActivityTest
Test: atest android.app.activity.ActivityThreadClientTest
Test: atest android.view.DisplayTest
Test: atest android.window.ConfigurationHelperTest
Test: atest android.window.SizeConfigurationBucketsTest
Change-Id: Ie439ff3706dab35e875c1eb995a67fa73aec4d76