Merge "[MS59.3] Expose NetworkStatsDataMigrationUtils" am: 853b6f6ede am: cfb860d019 am: 7cdd324483

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1961599

Change-Id: I4951b6ce5f949246be7b247f9b4ab92b2a9de721