Add a test for metered/non-metered mobile network am: 2685c929f4 am: bbb828ef8e am: da7a6dcdbc

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1779527

Change-Id: Ib488cf88a243b2fd3c74dfa8a87322ea0f72d9b2