Fix issue #4931: Make use of microagents configurable in codeact_agent

[openhands-agent]

This pull request fixes #4931.

The issue has been successfully resolved. The AI implemented all requested functionality by:

1. Adding configuration options to customize microagent usage:

   • use_microagents boolean flag to enable/disable all microagents
   • disabled_microagents list to selectively disable specific agents

2. Making the necessary code changes across multiple files to support these features:

   • Added new config fields to AgentConfig
   • Updated PromptManager to handle disabled agents
   • Modified CodeActAgent to respect these settings

3. Added comprehensive test coverage to verify the new functionality works as expected

The implementation matches the requested UX requirements and technical implementation suggestions from the original issue. The changes allow users to:

• Completely disable microagents by setting use_microagents=False
• Selectively disable specific microagents via disabled_microagents list
• Maintain default behavior of enabling all microagents when no configuration is provided

All tests are passing, indicating the changes work as intended without breaking existing functionality.

This PR successfully adds the requested customization capabilities while maintaining backward compatibility.

Automatic fix generated by OpenHands 🙌

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To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:0b40b51-nikolaik   --name openhands-app-0b40b51   docker.all-hands.dev/all-hands-ai/openhands:0b40b51

[rbren]

Crushed it, afaict