add step prepare and browser clean up

[LawyZheng]

🚀	This description was created by Ellipsis for commit ea97f7e

Summary:

Added step preparation and browser cleanup functionality across agent, agent_functions, browser_factory, and browser_manager modules.

Key points:

• Added prepare_step_execution method in skyvern/forge/agent_functions.py to prepare for step execution.
• Modified agent_step in skyvern/forge/agent.py to call prepare_step_execution before executing a step.
• Updated BrowserContextFactory in skyvern/webeye/browser_factory.py to return a BrowserCleanupFunc.
• Ensured BrowserCleanupFunc is called in BrowserState.close method in skyvern/webeye/browser_factory.py.
• Updated BrowserManager in skyvern/webeye/browser_manager.py to handle the new BrowserCleanupFunc.

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[ellipsis-dev]

❌ Changes requested. Reviewed everything up to ea97f7e in 42 seconds

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