Expose correlation ID in overloaded message

What does this MR do and why?

A few days before raising gitlab-com/gl-infra/production#19438 (closed), we already noticed an increase in CI jobs erroring with GitLab is currently unable to handle this request due to load. However, this is very hard to debug since we do not know any more details about the request.

Therefore, this exposes the correlation ID of the request in these overloaded messages through Workhorse. That will make investigating these errors much easier and efficient, since we can use it to search the logs to find the root cause.

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