Change actions view disabling logic

1. Introduces "central task" - the task relating to the actions view
2. Decouple the overlay and actions view
3. Undo filter of taskViewType == SINGLE for overlay as it can be enabled for split tasks as well

Bug: 402351284
Flag: com.android.launcher3.enable_refactor_task_thumbnail
Test: OverviewImageTest (attached abtd run)
Test: OverviewMenuImageTest (attached abtd run)
Change-Id: Id7bc5c9c6620183d91e99d9dc5d2980eb8e3ec36