Fix for histogram corruption in Sidekiq

See merge request gitlab-org/gitlab-ce!32453

(cherry picked from commit 79011fab)

e4568a48 Fix for histogram corruption in Sidekiq

Fix for https://gitlab.com/gitlab-org/gitlab-ce/issues/66319.

This adds diirect monitoring for sidekiq metrics. This is done via
sidekiq middleware and a sampler to pull from sidekiqs api.