Removes namespace from Sidekiq probe
This MR removes the use of namespace in gitlab-exporter's sidekiq probe. It contains 2 commits
- reverts commit 02831d8c, reversing changes made to 3ae86e8a.
- removes
namespace
key from theSidekiq.redis
config.
This is part of gitlab-com/gl-infra/scalability#2288 (closed)