Rename NetworkUsageStatsTest and move to networking CTS tests. am: eb8d8554bb am: 3738ea8525 am: 0aaa93104b

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1967179

Change-Id: I6acabeea0073e71512e8f86967140fad926a5176