[4/7]Add PlatinumTest annotation to tests am: 5bde3f8573 am: f4c8a29eac

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/23395253

Change-Id: I4ae5b30382e745ad6f491525819b3fae3f875c27
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>