Slow Chain::ComponentUsage on pipeline creation

Summary

While working on the incident #inc-5358-increase-in-timeout-error-processing-external-cicd-included-yaml-f and https://gitlab.com/gitlab-com/request-for-help/-/issues/3547, I realized that Chain::ComponentUsage is slow.

https://log.gprd.gitlab.net/app/r/s/2T6vm

Sometimes 10> seconds!

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I recently added Chain::ComponentUsage to our dashboard on https://log.gprd.gitlab.net/app/r/s/r5Owf.

Proposal

Extract the logic into a worker.