Remove pubsub storage selector from redis-pubsub
This MR removes the pubsub
selector from redis-pubsub
as it is removed with gitlab-org/gitlab!133066 (merged) being merged. See gitlab-com/gl-infra/scalability#2539 (closed).
The clean-up was perform prior to the MR's merge so it is safe to proceed with this since the selector was no longer in use as of 19 Oct.
Edited by Sylvester Chin