Merge "[MS59.3] Expose NetworkStatsDataMigrationUtils" am: 8de5088578 am: e156948ba1 am: ea3eef06bb

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

Change-Id: I4951b6ce5f949246be7b247f9b4ab92b2a9de721