Move the CtsHostsideNetworkTestsAppNext to avoid automerger conflict

Move the CtsHostsideNetworkTestsAppNext to the top of file to to prevent
any future automerger merge conflict between aosp and downstream
branches. The CtsHostsideNetworkTestsAppNext target will not exist in
some downstream branches, but it should exist in aosp and some
downstream branches.

Test: atest -c CtsHostsideNetworkTests
Bug: 270006466
Merged-In: I8cb64d8bb86b781cd57d1a1a466c56185573fcc2
Change-Id: Icc475586d6f26d913b328647b94af1b53a3bb32d