Fix jump when dismissing last grid task View

- Calcualte the scroll diff to bring large tile to middle of screen
- Additional compensate for scroll diff between last task and ClearAllButton if ClearAllButton is visible

Fix: 395883390
Test: manual, not adding e2e because animation jump cannot be caught by e2e test
Flag: com.android.launcher3.enable_grid_only_overview
Change-Id: I6a506f2af46ded4daf21fe49329ab71b59e3f19d