This patch removes elasticsearch from the mastodon container image, as
it's not used in production anyway. Therefore the removal will simplify
the upgrade process finally allowing an idempotent upgrade to 4.2.1.

This patch increases CPU requests and limits for the DNS resolver pods
in order to improve response times. Currently the blocky process is
throttled in 20-30% of time, which is not ideal.

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.