Revert "Merge branch 'improve-jobs-queuing-time-metric' into 'master'"

What does this MR do?

This MR https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/17730 cause a serious problem with picking CI jobs which makes the CI pipeline to fail. Let's revert and solve that separately.

Problem is visible in: https://sentry.gitlap.com/gitlab/devgitlaborg/issues/158746/

What are the relevant issue numbers?