Merge "[Thread] add CTS test for registerNetworkCallback for Thread" into main am: ad93a191e7

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2909780

Change-Id: Id811aba5386564df348130c4294dd666b61c10c0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>