[automerged blank] Add @FlakyTest annotation to LegacyProviderMigrationTest 2p: a63a23ec2e

Blank merge reason: Change-Id I9a47c4928d18bfe33cd7f181bd4942e45720d7d5 with SHA-1 3429c3354b is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/providers/MediaProvider/+/13356032

Change-Id: Ie21e05925e85db559ca676777b88faf1079af7b6