[automerger skipped] Merge "Test for unexpected prefix updates in...

[automerger skipped] Merge "Test for unexpected prefix updates in SetAndClearNat64Prefix." into rvc-dev am: d5de13da am: 67bdfa12 am: 96fb29c7 -s ours

am skip reason: Change-Id Ic86f93161293b4ad5366fd9cab2e26d4a6f636c4 with SHA-1 5be8bf29 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/11598146

Change-Id: Ib174921cbb112aad762f60f1f2cc0064fe83cd40