add qwen model to the copilot model table

[minsa110]

Per https://github.com/github/product-and-privacy-legal/issues/1743#issuecomment-3331142187

cc\ @kevinmerchant @6hl @dvelton @justb0b

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[Copilot]

Pull Request Overview

This PR adds the Qwen2.5 AI model to GitHub Copilot's model documentation by defining a new variable and including it in the model comparison table. The change supports the expansion of available AI models for Copilot users.

Key changes:

• Adds Qwen2.5 model variable definition
• Includes Qwen2.5 in the model comparison table with specifications

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
data/variables/copilot.yml	Defines the copilot_qwen_25 variable for the Qwen2.5 model name
content/copilot/reference/ai-models/model-comparison.md	Adds Qwen2.5 to the model comparison table with capabilities and model card link

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Source	Review	Production	What Changed
copilot/reference/ai-models/model-comparison.md	fpt ghec	fpt ghec

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