Revert "feat(dns): Add dns blocklists"

After deploying the blocklists, resolve times skyrocketed, probably due
to limited CPU time. The gain by blocklists is marginal, throughout the
past few hours just 2 dns resolutions have been blocked.

Given the major impact this has with minor benefits, reverting from the
usage of blocklists seems like the right move.

This reverts commit 2532a967.