This makes us to switch to use Puma from:
- https://gitlab.com/gitlab-org/gitlab-puma
- https://gitlab.com/gitlab-org/gitlab-puma_worker_killer

This is needed to test a latest latency improvements
for Puma to improve, Puma scheduling mechanism.

This is meant to be temporary as part of effort to upstream
the https://github.com/puma/puma/pull/2079