Merge "Use `PushFilePreparer` to push files in PreloadCheck" am: 6040384899 am: 2570d996db

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2198760

Change-Id: I04913ce45215927a413bad4828e997ff22ca30b5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>