Fix agentops unauthorized errors and deprecated call

[areibman]

📥 Pull Request

📘 Description
Resolves AgentOps integration issues by:

• Updating deprecated agentops.end_session() to the new agentops.start_trace() and agentops.end_trace() API.
• Enhancing API key handling to prevent 401 Unauthorized errors.
  Includes updated examples, comprehensive documentation, and a migration helper script for existing codebases.

🧪 Testing
Validated fixes by running the test_fix.py demonstration script and ensuring the crewai_agentops_fixed.py example is correctly configured for execution with proper API keys.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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[github-actions]

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