Add test to check IpClientLinkObserver stops working when ENOBUFS happens. am: d83a6a8045

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/18816726

Change-Id: Ie0254fd521e3e2ea0b2412ce42e9e712c96653b7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>