Fix live tile in dismiss and swipe down animation

- Add separate property for grid translation in TaskViewSimulator, so it doesn't get reset when other translations (e.g. dismiss) is applied to live tile
- In createAdjacentPageAnimForTaskLaunch, use onAnimationStart without isReverse parameter, so it's actually called when the PendingAniamtion starts
- Also reset pivot if we have overriden it during createAdjacentPageAnimForTaskLaunch
- Also avoid applying addOverviewToAppAnim on live tile if it's not launching, otherwise recentsViewScale will be applied twice with addOverviewToAppAnim applying wrong value
- Use pivot instead of recentsViewScroll to bring non scroll position live tiel to fullscreen, to avoid a trajectory that will otherwise travel left and then right

Fix: 391146807
Fix: 321013528
Test: launching via swipe down with non-launching live tile
Test: dismissing live tile
Test: launching live tile in non scroll position
Flag: com.android.launcher3.enable_grid_only_overview
Change-Id: I24ee85399b09b25e157a8986103658bb4803a87e