feat: enhance agent identity roles and clean up deploy.py

[eliasecchig]

Summary

• Add IAM roles for agent identity: cloudapiregistry.viewer, logging.logWriter, monitoring.metricWriter
• Remove unused agent_config dict (dead code)
• Consolidate duplicate "Deploying to Vertex AI..." messages into single dynamic message
• Simplify grant_agent_identity_roles docstring
• Remove redundant etag comment

Changes

• New roles enable API Registry access and observability (logging/metrics) for agent identity
• Code cleanup reduces deploy.py by 10 lines while maintaining functionality

[gemini-code-assist]

Summary of Changes

Hello @eliasecchig, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly improves the agent deployment process by enhancing the agent's identity with crucial IAM roles for API registry access, logging, and monitoring. Concurrently, it refines the deploy.py script through targeted code cleanup, eliminating unused variables and consolidating redundant deployment messages, which collectively leads to a more robust and maintainable codebase.

Highlights

• IAM Role Enhancement: Added cloudapiregistry.viewer, logging.logWriter, and monitoring.metricWriter IAM roles for agent identity, enabling API Registry access and observability.
• Code Cleanup: Removed the unused agent_config dictionary, reducing dead code.
• Deployment Message Consolidation: Streamlined deployment messages by replacing separate 'Creating' and 'Updating' messages with a single, dynamic message.
• Docstring Simplification: Simplified the docstring for grant_agent_identity_roles.
• Comment Removal: Removed a redundant etag comment.

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[gemini-code-assist]

Code Review

This pull request introduces several good cleanups to the deploy.py script, improving code clarity and reducing duplication. The removal of dead code, consolidation of deployment messages, and refactoring of parameter logging are all positive changes. The main feature, adding more IAM roles for the agent identity, is also implemented as described. I've identified one important issue regarding idempotency that could cause deployment failures and one suggestion to improve maintainability.