Add PR number to chat panel PR card title for easier identification

[Copilot]

When using the #activePullRequest variable in chat, the PR card that appears in the chat panel displays only the title and author, making it difficult to confirm which PR is being referenced. This is especially confusing when multiple PRs are open, as users need to cross-reference with the status bar to verify the correct PR number.

Before:

[WIP] Expanding Jupyter Notebook with Additional Cells - bamurtaugh

After:

#71 [WIP] Expanding Jupyter Notebook with Additional Cells - bamurtaugh

This change prepends the linkTag property (which contains the PR number like "#71") to the existing title format in the chat PR card. The linkTag data was already available in the IChatPullRequestContent interface but wasn't being displayed.

Benefits:

• Users can instantly verify they're looking at the correct PR without checking the status bar
• Reduces confusion when working with multiple open PRs
• Maintains consistency with how PR numbers are displayed elsewhere in VS Code
• Minimal change with no breaking functionality

The implementation modifies a single line in ChatPullRequestContentPart to include the PR number in the card title display.

Fixes #266052.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• electronjs.org
  • Triggering command: node-gyp (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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