Make RepoContext work outside of GitHub repos

[Copilot]

Fixes microsoft/vscode#256597

Problem

The current RepoContext component in the agent prompt was limited to GitHub repositories because it used getGitHubRepoInfoFromContext(), which only returns information for GitHub repos. This blocked the component from providing valuable SCM context for CI/CD tools and other use cases in non-GitHub repositories.

When working with Azure DevOps, GitLab, or other Git repositories, the RepoContext component would fail silently and provide no repository context to the AI assistant, limiting its ability to understand the codebase structure and provide relevant suggestions.

Solution

This PR updates the RepoContext component to work with any Git repository, not just GitHub repositories:

Key Changes

1. Use generic repository detection: Replace getGitHubRepoInfoFromContext() with getOrderedRepoInfosFromContext() which supports GitHub, Azure DevOps, and other repository types

2. Provide repository context regardless of type: Show basic repository information (current branch, repository name/path) even for repositories that aren't GitHub or Azure DevOps

3. Handle GitHub-specific features gracefully: Only attempt to fetch GitHub-specific information (like PR descriptions) when the repository is actually hosted on GitHub

4. Maintain backward compatibility: Keep the same output format and behavior for GitHub repositories

Repository Support Matrix

Repository Type	Information Displayed
GitHub	Repository name, Owner, Current branch, Default branch*, Active PR*
Azure DevOps	Repository name, Organization, Project, Current branch
Other Git	Repository name, Repository path, Current branch
Local	Repository name, Repository path, Current branch

* Only available when GitHub PR extension is installed and accessible

Example Output

Before (GitHub only):

// GitHub repo
Repository name: vscode-copilot-chat
Owner: microsoft
Current branch: main

// Azure DevOps repo
(No output - component fails silently)

After (All repository types):

// GitHub repo (unchanged)
Repository name: vscode-copilot-chat
Owner: microsoft
Current branch: main

// Azure DevOps repo (now works!)
Repository name: myproject
Organization: myorg
Project: myteam
Current branch: develop

// GitLab repo (fallback)
Repository name: my-gitlab-project
Repository path: /workspace/my-gitlab-project
Current branch: main

Benefits

• Broader compatibility: Works with Azure DevOps, GitLab, and other Git repositories
• Better CI/CD support: Provides useful repository context for CI/CD tools regardless of hosting platform
• Consistent behavior: Always shows repository context when available, rather than failing silently
• Backward compatibility: No breaking changes for existing GitHub repository usage

Testing

Added comprehensive unit tests covering:

• GitHub repository detection and information extraction
• Azure DevOps repository support
• Fallback behavior for unknown repository types
• Local repository handling
• Error handling for GitHub-specific features

Fixes microsoft/vscode#256753

Created from VS Code via the GitHub Pull Request extension.

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