feat: add agent identity support for Agent Engine deployments

[eliasecchig]

Summary

• Add optional --agent-identity flag to deploy.py for Agent Engine deployments
• Add AGENT_IDENTITY=true parameter support in Makefile
• Auto-grant required IAM roles to agent identity principal on deployment
• Use v1beta1 API when agent identity is enabled (required for identity_type)
• Update dependency lock files

Changes

• Makefile: Add usage comment and $(if $(AGENT_IDENTITY),--agent-identity) to deploy target
• deploy.py:
  • Add --agent-identity CLI flag
  • Import IdentityType and Resource Manager dependencies
  • Add grant_agent_identity_roles() function to grant required IAM roles
  • Create empty agent with identity first, grant roles, then update with code
  • Use v1beta1 API version when agent identity is enabled

Usage

make deploy AGENT_IDENTITY=true

[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 enhances the Agent Engine deployment process by integrating support for agent identity. This feature enables fine-grained IAM access control for individual agents, improving security and resource management. The changes involve modifications to the deployment script and Makefile to allow users to opt-in to agent identity, along with automated IAM role assignment and API version handling to facilitate this new capability.

Highlights

• Agent Identity Support: Introduced support for agent identity in Agent Engine deployments, allowing for per-agent IAM access control and enhanced security.
• Deployment Flag and Makefile Integration: Added an optional --agent-identity CLI flag to deploy.py and integrated AGENT_IDENTITY=true parameter support in the Makefile for easy activation of the feature.
• Automated IAM Role Granting: Implemented automatic granting of necessary IAM roles (aiplatform.expressUser, serviceusage.serviceUsageConsumer, browser) to the agent's effective identity during deployment.
• API Version Management: Ensured the use of the v1beta1 API version for Agent Engine deployments when agent identity is enabled, as this is required for the identity_type configuration.

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[gemini-code-assist]

Code Review

This pull request introduces support for agent identity in Agent Engine deployments, allowing for per-agent IAM access control. The changes include adding a new --agent-identity CLI flag to deploy.py, integrating AGENT_IDENTITY=true into the Makefile, and implementing a function to automatically grant necessary IAM roles. The deployment logic has been updated to use the v1beta1 API when agent identity is enabled, and to handle the creation of an empty agent for identity provisioning before the full deployment. Overall, the changes are well-structured and address the stated goal. However, there are a couple of areas related to IAM policy management that could be improved for robustness and maintainability.