8.12-m02-int: Explain a test [TIMEOUT] instead of killing it silently (#15879)

发生了什么

A hung test run tells us almost nothing today. When no client has made progress for --timeout seconds, test_server_cron prints the clients' last reported state, SIGKILLs every server via force_kill_all_servers and exits; --dump-logs only fires for a failed or excepted test, never for a timeout. So a 20-minute hang costs a whole CI run and produces a few lines. Collect the evidence before tearing the run down: Crash-…

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