Don't prompt to fetch additional remotes when user explicitly configures them

[Copilot]

• Understand the problem: When users configure githubPullRequests.remotes with explicit remotes, the system should automatically fetch from all configured remotes instead of prompting "Continue fetching from other remotes"
• Identify the root cause: In fetchPagedData method (folderRepositoryManager.ts), the loop breaks early after finding results from first remote, causing hasUnsearchedRepositories to be true
• Modify fetchPagedData to continue through all configured remotes when user has explicitly set them
• Run linting and build checks - all passed
• Address code review feedback - improved variable names and readability
• Remove unrelated file changes
• Run security checks - no vulnerabilities found
• Fix hasMorePages to show "Load more" button correctly

Summary

The fix now correctly:

• Shows "Load more" when any repository has more pages (using itemData.hasMorePages)
• Shows "Continue fetching from other remotes" only when breaking early with unsearched repositories
• Automatically searches all configured remotes without prompting when user explicitly sets them

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Don't ask to fetch additional remotes when I provide a full list</issue_title>
<issue_description>Microsoft/vscode#67294

I set this:

  "githubPullRequests.remotes": [
    "ups",
    "origin"
  ]

But it still asks to fetch all of them, it should do this automatically as I've said I'm interested in those remotes.

</issue_description>

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

@Tyriar This is pretty annoying, every time I want to checkout/review a PR in xterm.js I need to click continue fetching (because my fork still has a PR in it).

• Fixes Don't ask to fetch additional remotes when I provide a full list #870

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[alexr00]

Now the "load more" doesn't show. We still want that to show, just not the "continue fetching from other remotes".

[Copilot]

Now the "load more" doesn't show. We still want that to show, just not the "continue fetching from other remotes".

Fixed in commit ac92efd. Changed the final return to preserve itemData.hasMorePages instead of hardcoding it to false. This ensures "Load more" shows when any repository has more pages, while "Continue fetching from other remotes" only appears when breaking early with unsearched repositories.