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Add workhorse instrumentation for CI runner pubsub

Jacob Vosmaer requested to merge jv-instrument-runner-pubsub into master

Part of gitlab-com/gl-infra/scalability#1867 (closed).

Currently, Workhorse receives a firehose of pubsub messages for CI runner long polling. We don't know how many of these messages get used. This MR add instrumentation that will let us investigate if an alternative messaging algorithm would lead to a lighter Redis workload.

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