Add realtime job status to UI

What does this MR do and why?

This MR adds the ability to get real-time jobs status updates on the job log view. Currently behind feature flag ci_job_status_realtime. This MR is part of a larger effort &16394 to have all CI related statuses in the product real-time and all in sync.

References

Screenshots or screen recordings

How to set up and validate locally

1. Enable FF ci_job_status_realtime
2. Visit Build > Jobs
3. View a job and retry it or start a new one
4. See real-time updates

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #538392 (closed)