Copilot: Update: Add User group membership authenticate

[quge009]

Add:

• in 'AGENT_LOCAL' mode:
  • return dev purpose admin (bool) and virtual_cluster (list)
• in production mode
  • get value of key 'admin' and 'virtualCluster' from rest server api
• authenticate logic:
  • if user is admin, or user is not admin but belong to a valid vc (set via env: COPILOT_VALID_VCS), authenticate success
  • else, authenticate fail
  • user's authenticate state will be valid inside Copilot for 1 hour, access within valid duration won't require rest server api call, access after valid duration requires rest server api call

[Copilot]

Pull Request Overview

This PR implements user group membership authentication for the Copilot system, adding support for both local development mode and production REST API authentication.

• Adds REST API integration to verify user authentication via the rest server
• Updates authentication logic to check admin privileges and virtual cluster membership
• Changes configuration from "valid-groups" to "valid-vcs" (virtual clusters) across deployment files

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
authentication.py	Implements production REST API authentication and updates local auth logic to return admin/virtual cluster info
copilot-chat-deployment.yaml.template	Updates environment variable name from COPILOT_VALID_GROUPS to COPILOT_VALID_VCS
copilot-chat.yaml	Changes configuration key from valid-groups to valid-vcs

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