Remove hive-authzv2 binding and tests modules completely

Hive authv2 support is already part of the sentry-binding-hive and sentry-tests-hive since Sentry 2.0. However, the hive-authzv2 modules, such as sentry-binding-hive-v2 ad sentry-tests-hive-v2 were left in case they were needed, but they are not used anymore.

We should remove those modules completely.