Switch agent templates from OPENAI_API_KEY to LITELLM_API_KEY #1113

Job	Run time
find-tutorials	3s
test-00_sync/010_multiturn	2m 46s
test-10_async/00_base/000_hello_acp	1m 59s
test-10_async/00_base/020_streaming	1m 55s
test-00_sync/030_langgraph	3m 8s
test-00_sync/000_hello_acp	1m 59s
test-10_async/00_base/040_other_sdks	3m 36s
test-10_async/00_base/080_batch_events	2m 49s
test-10_async/00_base/030_tracing	1m 49s
test-00_sync/020_streaming	2m 30s
test-10_async/10_temporal/020_state_machine	2m 15s
test-10_async/10_temporal/070_open_ai_agents_sdk_tools	1m 56s
test-10_async/10_temporal/030_custom_activities	1m 43s
test-10_async/10_temporal/080_open_ai_agents_sdk_human_in_the_loop	18s
test-10_async/10_temporal/010_agent_chat	8m 4s
test-10_async/10_temporal/000_hello_acp	1m 55s
test-10_async/10_temporal/050_agent_chat_guardrails	1m 53s
test-10_async/00_base/010_multiturn	2m 8s
test-10_async/00_base/100_langgraph	2m 12s
test-10_async/10_temporal/090_claude_agents_sdk_mvp	1m 52s
test-10_async/10_temporal/060_open_ai_agents_sdk_hello_world	2m 6s
Test Summary	3s
	48m 59s

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