fix(core): handle partial llm_request in BeforeModel hook override#22326

SandyTao520 merged 1 commit intogoogle-gemini:maingoogle-gemini/gemini-cli:mainfrom

krishdef7:fix/before-model-hook-model-override-cleankrishdef7/gemini-cli:fix/before-model-hook-model-override-cleanCopy head branch name to clipboard