fix(listener): record gha_job_queue_duration_seconds from JobAvailable#25
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GitHub does not populate QueueTime on JobStarted messages, so stash the queue time when JobAvailable is received and emit the histogram when the matching job starts. Fixes the broken metric added in mercari#19 and aligns with the approach from closed PR mercari#23.
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Summary
gha_job_queue_duration_secondsso it records meaningful values instead of always emitting zeroQueueTimeonJobStartedmessages; queue time is now captured whenJobAvailableis received and matched byRunnerRequestIDwhen the job startsThis addresses the bug in #19 and implements the approach from closed PR #23 (without the temporary debug logging).
Test plan
TestJobQueueDurationMetricincmd/ghalistener/metrics/metrics_test.goMade with Cursor