[WIP] Add button to open issue or PR from summary

[Copilot]

Summary

Added "Open" button to issue/PR and notification thread summaries in panel-chat and quick-chat.

Changes Made

• Add "Open" button to notification summary tool (summarizeNotificationsTool.ts)
• Add "Open" button to issue/PR summary tool (summarizeIssueTool.ts)
• Add issueNumber and itemType fields to FetchIssueResult (fetchIssueTool.ts)
• Run linters and ensure code quality
• Request code review (1 false positive comment addressed)
• Run security checks (CodeQL - no alerts)

Implementation Details

The "Open" button:

• Opens the issue/PR/notification in the user's default browser
• Uses the vscode.open command with a properly formatted GitHub URL
• Appears alongside "Mark as Read" and "Mark as Done" buttons for notifications
• Follows the same pattern as existing command buttons using TOOL_COMMAND_RESULT
• Only appears when all necessary information (owner, repo, issue number, item type) is available

All automated checks passed successfully.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add button to open the issue or PR or thread from a summary in panel-chat or quick-chat</issue_title>
<issue_description>Currently after summarizing an issue/PR/notification thread, we add a button that says Mark as Read at the end. It would be nice to have another button to open the issue/PR/notification thread after having read the summary. I imagine there may be people who may want to see the original.

cc @alexr00 @lszomoru </issue_description>

Comments on the Issue (you are @copilot in this section)

@lszomoru Absolutely. We have have "Mark as Read", "Mark as Done", and "Open" actions.

• Fixes Add button to open the issue or PR or thread from a summary in panel-chat or quick-chat #6397

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