Graduate ThreadNetworkIntegrationTests from postsubmit am: 7cc1c37c5f

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2911490

Change-Id: Icdb0fae334ee4758d4a8e3dba5e5cbb4c09983c0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>