feat: Add region property to ModelConfig #715

Job	Run time
server-ai-linux (3.12)	16s
server-ai-openai-windows (3.10)	26s
server-ai-linux (3.13)	16s
server-ai-openai-windows (3.14)	26s
server-ai-openai-windows (3.12)	22s
server-ai-linux (3.10)	16s
server-ai-openai-windows (3.11)	25s
server-ai-windows (3.14)	18s
server-ai-windows (3.13)	31s
server-ai-openai-linux (3.11)	24s
server-ai-langchain-windows (3.12)	22s
server-ai-windows (3.12)	27s
server-ai-linux (3.14)	16s
server-ai-langchain-linux (3.13)	23s
server-ai-langchain-windows (3.14)	27s
server-ai-optimization-linux (3.12)	10s
server-ai-linux (3.11)	16s
server-ai-langchain-windows (3.10)	20s
server-ai-optimization-linux (3.11)	11s
server-ai-langchain-linux (3.11)	19s
server-ai-openai-linux (3.13)	25s
server-ai-langchain-linux (3.10)	21s
server-ai-langchain-windows (3.13)	35s
server-ai-optimization-linux (3.14)	11s
server-ai-windows (3.11)	24s
server-ai-optimization-linux (3.13)	15s
server-ai-windows (3.10)	34s
server-ai-langchain-windows (3.11)	25s
server-ai-openai-linux (3.14)	27s
server-ai-langchain-linux (3.14)	25s
server-ai-openai-linux (3.12)	29s
server-ai-optimization-linux (3.10)	12s
server-ai-openai-linux (3.10)	27s
server-ai-optimization-windows (3.10)	18s
server-ai-langchain-linux (3.12)	23s
server-ai-optimization-windows (3.13)	20s
server-ai-openai-windows (3.13)	21s
server-ai-optimization-windows (3.12)	20s
server-ai-optimization-windows (3.14)	20s
server-ai-optimization-windows (3.11)	22s
	14m 25s

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