[RFCLAT#8] clatd_test: remove or refactor tests for configure_clat_ipv6_address am: 049cbd87b3 am: e19a77c770

Original change: https://android-review.googlesource.com/c/platform/external/android-clat/+/1903813

Change-Id: Ib0a2904a750a7f4a732c8a07039efd1f44b9fecc