Add CTS test for ConnectivityManager#tether exception after V

Current test was mistakenly added to the unit test version of
ConnectivityManagerTest instead of the CTS test. Move this to the CTS
test instead.

Bug: 392986269
Test: atest android.net.cts.ConnectivityManagerTest
Change-Id: Id64d21929fb6b6c42f46a821a3cd28bbcaf77cda
2 files changed