Merge "Run private DNS validation asynchronously" into main am: 81ab4a55f3

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/2600105

Change-Id: Iabbfb7eb6205478ca659709c8383a213ec3b31f6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>