Revert "Revert "Provide AllApps item OnLongClickListener through ActivityContext.""

This reverts commit 853a5b9e.

Fixes SecondaryDisplayLauncher class by using lambda instead of method
reference for #getAllAppsItemLongClickListener. This change is necessary
because mDragLayer is late-init.

Test: Home Settings > Developer Options > Launch Secondary Display
Bug: 289261756
Flag: No
Change-Id: I7b83f81651dde360edea6ee7bea6cc82441e6bef