Remove NetworkIdentitySet usage in CTS am: 5711f9e6ae am: 541d31524c

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/18399677

Change-Id: Ic98bd9c840f3cdae561ff353927f20eabdf6e64a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>