Draft: Introduce service to import finished builds to ClickHouse

What does this MR do and why?

This MR introduces a service to import finished builds to ClickHouse, behind a new FF. A follow-up MR will introduce the worker that will leverage this service.

EE: true

Part of #421200 (closed)

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Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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