Remove CtsHostsideNetworkTestAppNext.

This is now identical to CtsHostsideNetworkTestsApp, and we're
getting rid of -Next targets anyway, so there's no point in
keeping it.

Bug: 365191921
Test: atest CtsHostsideNetworkTests
Change-Id: I57eb7c6d9bc37d222a9449bbc85265e7c6ec9ffc
3 files changed