GitLab Runners should report all IP addresses in X-Forwarded-For header

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Proposal

Right now, GitLab is collapsing the X-Forwarded-For into a single IP address. This causes confusion in environments that have multiple proxies that are relaying the X-Forwarded-For IP addresses. For example, users that have a strict environment with environment settings might have an allow list with specific IP addresses but runners being proxied may show an unexpected address in the Runner status page.