[RFCLAT#8] clatd_test: remove or refactor tests for configure_clat_ipv6_address am: 049cbd87b3 am: e19a77c770 am: 10d7d21ded

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

Change-Id: Iab584dc8199f2b9fb6f7512f6724389cc5173771