Add TaskFragmentOrganizer#onActivityReparentToTask

When the activity exits PiP and is reparented to the original Task, the
organizer should handle it as a new launch.

Bug: 225371112
Test: atest WmTests:TaskFragmentTest
Test: atest WmTests:TaskFragmentOrganizerControllerTest
Change-Id: Ia7e32e995a35e167b0d76e701c972b269ae068cc

data/etc/services.core.protolog.json

@@ -3031,6 +3031,12 @@
       "group": "WM_DEBUG_FOCUS_LIGHT",
       "at": "com\/android\/server\/wm\/DisplayContent.java"
     },
+    "873160948": {
+      "message": "Activity=%s reparent to taskId=%d",
+      "level": "VERBOSE",
+      "group": "WM_DEBUG_WINDOW_ORGANIZER",
+      "at": "com\/android\/server\/wm\/TaskFragmentOrganizerController.java"
+    },
     "873914452": {
       "message": "goodToGo()",
       "level": "DEBUG",