👥 Implement `Agent Teams`

[echarles]

Agent Teams

• Refactor agent-teams based on https://ai.pydantic.dev/multi-agent-application and pydantic-ai Beta Graph API
• Implement planning sub-agent, built-in planner that decomposes complex tasks into steps before execution in agent-runtimes based on agent-teams - Add an example to illustrate that feature.
• Review the AgentTeamNew.tsx and AgentTeam.tsx mock content and make sure agent-teams support the requested features.
• Update the needed backend services, dockerfiles and helm charts for agent-teams
• Wire the pages showing mock agent teams
• Remove the New Agent Team menu from the feature gate so users can use the new agent team features.