Add a CTS test to verify the removal of ServiceTypeClients am: da18a53cff

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2967209

Change-Id: Id181bc62c41b179bd90c5b39c9e711ab69fd4ac0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>