Fix agent lifecycle example output to reflect correct hook execution order

[DanielHashmi]

Problem:
The expected output in the agent lifecycle example incorrectly shows agent start hooks (on_start) running after tool execution and multiple times for the same agent. This misleads developers about when these lifecycle events actually occur.

Solution:
Updated the expected output to accurately reflect the OpenAI Agents framework behavior:

• Agent start hooks run immediately when an agent begins execution
• Start hooks only run once per agent activation, controlled by the should_run_agent_start_hooks flag
• After handoffs, the new agent's start hook runs as the first event