Add correlation_id to request logs

What does this MR do?

Adds correlation_id to request logs.

This should be easier, but the network code is now feral.

There have been previous attempts to add this (5 years ago!):

• Add correlation_id to request logs (!1423 - closed)
• Refactor gitlab api response handling (!1971 - closed)

This MR does the technique of Add correlation_id to request logs (!1423 - closed); simple for the code we have today, no refactor.

Why was this MR needed?

Correlate requests between GitLab and Runner.

What's the best way to test this MR?

Requests should now have a valid correlation_id.

What are the relevant issue numbers?

Closes #38656 (closed)