Postpone the request direct actions before onStart

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 will postpone the request direct actions a few times
before onStart().

Bug: 224789902
Test: atest CtsVoiceInteractionTestCases
Change-Id: If7cd52c5ba749523e575c0be5595e8f20704c4f2