fix(openai-agents): Isolate agent run #2988

Job	Run time
Gevent (pinned) (3.8, ubuntu-22.04)	6m 24s
Gevent (pinned) (3.11, ubuntu-22.04)	6m 11s
Gevent (pinned) (3.10, ubuntu-22.04)	6m 36s
Gevent (pinned) (3.12, ubuntu-22.04)	7m 17s
Gevent (pinned) (3.6, ubuntu-22.04)	3m 55s
All pinned Gevent tests passed	3s
	30m 26s

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