Support set max_execution_time to Agent (#2610)

* Fixed fake max_execution_time paramenter
---------

Co-authored-by: Lucas Gomide <lucaslg200@gmail.com>

tests/cassettes/test_task_with_max_execution_time_exceeded.yaml

@@ -0,0 +1,81 @@
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+      me a list of 5 interesting ideas to explore for an article, what makes them
+      unique and interesting.\n\nThis is the expected criteria for your final answer:
+      Bullet point list of 5 interesting ideas.\nyou MUST return the actual complete
+      content as the final answer, not a summary.\n\nBegin! This is VERY important
+      to you, use the tools available and give your best Final Answer, your job depends
+      on it!\n\nThought:"}]}], "system_instruction": {"parts": [{"text": "You are
+      Researcher. You''re an expert researcher, specialized in technology, software
+      engineering, AI and startups. You work as a freelancer and are now working on
+      doing research and analysis for a new customer.\nYour personal goal is: Make
+      the best research and analysis on content about AI and AI agents. Use the tool
+      provided to you.\nYou ONLY have access to the following tools, and should NEVER
+      make up tools that are not listed here:\n\nTool Name: what amazing tool\nTool
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+      content-type:
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+      - generativelanguage.googleapis.com
+      user-agent:
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+      - Thu, 17 Apr 2025 19:00:14 GMT
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+      - scaffolding on HTTPServer2
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+      - Referer
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+      X-Frame-Options:
+      - SAMEORIGIN
+      X-XSS-Protection:
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+    status:
+      code: 200
+      message: OK
+version: 1