Add GraphQL endpoint to query model info for Agentic Chat

Tetiana Chuprynarequested to merge
566562-api-for-model-selection-dropdown into master

What does this MR do and why?

Add GraphQL endpoint to query model info for Agentic Chat

Changelog: added EE: true

References

aiChatAvailableModels(rootNamespaceId: "gid://gitlab/Group/103") {
    defaultModel {
      name
      ref
    }
    selectableModels {
      name
      ref
    }
  }

How to set up and validate locally

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Related to #566562

Edited by Tetiana Chupryna

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