feat: Update OpenAI graph runner to return AgentGraphRunnerResult with GraphMetrics #626

Job	Run time
server-ai-optimization-windows (3.12)	22s
server-ai-windows (3.11)	41s
server-ai-openai-linux (3.13)	24s
server-ai-langchain-windows (3.14)	25s
server-ai-linux (3.10)	16s
server-ai-windows (3.12)	21s
server-ai-langchain-linux (3.12)	22s
server-ai-optimization-windows (3.10)	24s
server-ai-windows (3.10)	45s
server-ai-langchain-linux (3.10)	23s
server-ai-linux (3.13)	19s
server-ai-langchain-windows (3.13)	53s
server-ai-langchain-linux (3.13)	23s
server-ai-optimization-windows (3.13)	22s
server-ai-langchain-windows (3.10)	21s
server-ai-langchain-windows (3.11)	50s
server-ai-openai-linux (3.11)	28s
server-ai-windows (3.13)	27s
server-ai-openai-windows (3.10)	34s
server-ai-openai-windows (3.12)	38s
server-ai-linux (3.11)	20s
server-ai-openai-windows (3.11)	35s
server-ai-langchain-windows (3.12)	23s
server-ai-openai-linux (3.12)	31s
server-ai-windows (3.14)	21s
server-ai-linux (3.12)	16s
server-ai-langchain-linux (3.11)	19s
server-ai-optimization-linux (3.11)	11s
server-ai-langchain-linux (3.14)	23s
server-ai-openai-linux (3.14)	29s
server-ai-linux (3.14)	17s
server-ai-openai-windows (3.13)	26s
server-ai-optimization-linux (3.10)	15s
server-ai-optimization-linux (3.14)	17s
server-ai-optimization-linux (3.13)	11s
server-ai-optimization-windows (3.11)	27s
server-ai-optimization-linux (3.12)	11s
server-ai-openai-linux (3.10)	30s
server-ai-optimization-windows (3.14)	22s
server-ai-openai-windows (3.14)	1m 14s
	17m 36s

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