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

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

Change-Id: I7909d9b59e524904f6632fdab92012db3ea49541
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>