Configure the number of tasks to scan to determine Home visibility.

- Auto uses the multi display and its Home uses TaskView, so it's not enough to peek the top Tasks to get the visibility of Home.
- Set the default number of tasks to retrieve as 10 to scan all visible tasks.
- Don't query PM to check if the task is Home, check the ActivityType instead.

Bug: 236099098
Test: atest android.app.cts.ActivityManagerTest#testHomeVisibilityListener

Change-Id: I10b6d84292d3180f095dd9f8cf76b4c9db641091