CTS for default background network restrictions

Apps will now lose network access once they are in top-sleeping or
higher process state. Adding some cts tests to ensure correct behavior.

Test: atest CtsHostsideNetworkTests

BYPASS_INCLUSIVE_LANGUAGE_REASON=Existing method

Bug: 304347838
Change-Id: Iba7c7bd01309fa7a301fdc1524033f0fad5ae512
17 files changed