[release-0.18] Tune KubeRay e2e task durations for faster CI#12224
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The InTreeAutoscaling rayjob spec ran 3 tasks of 60s each. The long sleeps were sized so that tasks survive scale-up and pod replacement verification, but the retried task of the deleted worker alone added a full extra minute after verification was already done. Replace them with a queue of 20 tasks of 10s each: pending tasks hold worker demand through verification no matter how long scale-up or replacement takes, and the job drains quickly once the queue is empty. The multi scale-up spec ended with 32 sequential 1s tasks to keep the job alive while scale-down is verified. Idle detection takes idleTimeoutSeconds=10 plus the annotation update, so 20 tasks (~25s) are enough with margin.
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This is an automated cherry-pick of #12213
/assign mimowo