Add CUJ_DESKTOP_MODE_EXIT_MODE_ON_LAST_WINDOW_CLOSE to launcher side

Move the CUJ to where the actual animation is taking place, so we can
target the correct surface/leash.

Bug: 374214290
Flag: NONE jank logging
Test: manual

Change-Id: Iccb30ff7ceee84b68428606575e1b8588eeb8aa9

quickstep/src/com/android/launcher3/QuickstepTransitionManager.java

@@ -1746,6 +1746,10 @@ public class QuickstepTransitionManager implements OnDeviceProfileChangeListener
             if (rectFSpringAnim != null && anim.getChildAnimations().isEmpty()) {
                 addCujInstrumentation(rectFSpringAnim, Cuj.CUJ_LAUNCHER_APP_CLOSE_TO_HOME);
             } else {
+                if (isFreeformAnimation(appTargets)) {
+                    addCujInstrumentation(anim,
+                            Cuj.CUJ_DESKTOP_MODE_EXIT_MODE_ON_LAST_WINDOW_CLOSE);
+                }
                 addCujInstrumentation(anim, playFallBackAnimation
                         ? Cuj.CUJ_LAUNCHER_APP_CLOSE_TO_HOME_FALLBACK
                         : Cuj.CUJ_LAUNCHER_APP_CLOSE_TO_HOME);