Missing support for multiple runners with same ID/token in REST API v4

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Since 16.2 (or something like that) multiple runners can share the same runner token and ID (via the new registration flow). However, this is not reflected in the /runners resources in REST API v4.

When I start two gitlab-runner instances on two different machines with the same token, I can see in the web UI that the runner has two runner instances, each with its own system ID and IP address. But the /runners endpoint doesn’t provide this information, there’s no system_id and only one ip_address.

Related issues: #430809