Handle non-PendingIntent cases

When an activity is started, but not through a PendingIntent, don't
calculate for the sender at all and don't require opt-in.

Test: atest CtsPackageManagerTestCases:android.content.pm.cts.PackageManagerTest#testGetLaunchIntentSenderForPackage  ConnectivityCoverageTests:android.net.connectivity.com.android.server.connectivity.NetworkNotificationManagerTest#testNotifyNoInternet_asDialog SessionTest#sessionWithImmutablePendingIntent com.android.server.wm.ActivityStarterTests android.server.wm.BackgroundActivityLaunchTest

Bug: 306059525
Change-Id: I5575bbb69757b088890cdc7566928c1bcb86de78