Add "Don't suggest app" shortcut to suggested apps.

This works for suggested apps in both Home and AA+. When enable_shortcut_dont_suggest_app is true, the secondary drop target "Don't Suggest app" is removed instead "Don't suggest app" is added to shortcuts.

Video: https://b.corp.google.com/issues/319250810#comment5

Home: https://screenshot.googleplex.com/d7Wts48X6EmFAYg.png
Private space app suggested: https://screenshot.googleplex.com/BukzCRTvkzbpwQ3.png

AA+: https://screenshot.googleplex.com/ADMCHnQ378jvJEE.png
Private space app suggested : https://screenshot.googleplex.com/AYga8Km3646AqMt.png

Bug: 319250810
Flag: aconfig com.android.launcher.enable_shortcut_dont_suggest_app DEVELOPMENT
Test: Manual.

Change-Id: Ia7df749a1c7d806bd9d74124be138384c3050119

src/com/android/launcher3/logging/StatsLogManager.java

@@ -211,6 +211,9 @@ public class StatsLogManager implements ResourceBasedOverride {
         @UiEvent(doc = "User tapped on pin system shortcut.")
         LAUNCHER_SYSTEM_SHORTCUT_PIN_TAP(522),
 
+        @UiEvent(doc = "User tapped on don't suggest app system shortcut.")
+        LAUNCHER_SYSTEM_SHORTCUT_DONT_SUGGEST_APP_TAP(1603),
+
         @UiEvent(doc = "User is shown All Apps education view.")
         LAUNCHER_ALL_APPS_EDU_SHOWN(523),