Add iteration timeout to Ci::TimedOutBuilds::DropRunningWorker (behind FF)

Hordur Freyr Yngvasonrequested to merge
add-cooperative-iteration-timeout-to-drop-running-worker into master

What does this MR do and why?

Adds a cooperative iteration timeout to dropping stuck builds, to help prevent concurrent runs of the worker past the deduplication TTL. Disabled behind the feature flag ci_timed_out_builds_worker_timeout.

References

See gitlab-com/gl-infra/production#21274

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