[reset] Remove redundant calls in `resetAndScrollToPrivateSpaceHeader`.

1. When a user clicks a PS tile, fast scrolling is already end.
2. When a user clicks a PS tile, it should be in the search RV, so no need to handle header.
3. We need the `animateToSearchState` with 0 time because the one inside `resetSearch` with 300ms delay will conflict with the following scrolling to bottom. When `resetSearch` is called after `animateToSearchState(0)` finishes, the inside `animateToSearchState(300)` is just a no-op and return early, so we won't have redundant call.

Bug: 328505782
Test: manual
Flag: aconfig com.google.android.apps.nexuslauncher.enable_inject_private_space_tile nextfood
Change-Id: Ied9f96c276c8f7707c672425bebe81e72e0d3bae