Rename NetworkUsageStatsTest and move to networking CTS tests. am: eb8d8554bb am: 3738ea8525 am: 0aaa93104b am: 66ff08cd28

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

Change-Id: I730f3ebce92f843791fcd2a5d52b26e9c6e82930