Fix remote selection when upstream points to non-GitHub remote

[Copilot]

When a branch's upstream is set to a non-GitHub remote (e.g., origin pointing to an internal git server), getOrigin() throws BadUpstreamError even when valid GitHub remotes are configured via githubPullRequests.remotes. This breaks "Start Working on Issue" functionality.

Changes

• folderRepositoryManager.ts: Modified getOrigin() to fall back to configured GitHub remotes when upstream is not GitHub, using the same selection logic as when no upstream is set (by convention, by ownership, or first available)
• folderRepositoryManager.test.ts: Added test case verifying fallback behavior when branch upstream points to non-GitHub remote

Example scenario

// User config
"githubPullRequests.remotes": ["github"]

// Git remotes
github → github.com/user/repo
origin → internal-git.company.com/repo  // non-GitHub

// Current branch
main (upstream: origin/main)

// Before: throws BadUpstreamError
// After: uses 'github' remote

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Start Working on issue and checkout topic branch, does not uses the right remote.</issue_title>
<issue_description>
Type: Bug

I have two remotes configured:

• github, that points to github
• origin, that points to another git server.

I have configured my .vscode/settings.json to include:

{
    "githubPullRequests.remotes" : [
        "github"
    ]
}

I can fetch issues and pull request, but when i want to "Start Working on issue and checkout topic branch", by clicking on the button on the issues view. I got an error: "There is no remote. Can't start working on an issue."

On the Github Pull Request output panel, shows this:

2025-02-14 11:28:00.688 [error] FolderRepositoryManager+0> The remote 'origin' is not a GitHub repository.

Extension version: 0.105.2025021304
VS Code version: Code 1.97.2 (e54c774e0add60467559eb0d1e229c6452cf8447, 2025-02-12T23:20:35.343Z)
OS version: Linux x64 6.8.0-52-generic
Modes:

System Info

Item	Value
CPUs	AMD Ryzen 7 5700 (16 x 4491)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: disabled_off webnn: disabled_off
Load (avg)	1, 1, 1
Memory (System)	31.13GB (24.02GB free)
Process Argv	--crash-reporter-id 16bf3ff9-8a17-4b1f-87ec-4ca1c2e63352
Screen Reader	no
VM	0%
DESKTOP_SESSION	ubuntu
XDG_CURRENT_DESKTOP	Unity
XDG_SESSION_DESKTOP	ubuntu
XDG_SESSION_TYPE	x11

A/B Experiments

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6074i472:31201624
dwoutputs:31238123
customenabled:31237564
9064b325:31222308
copilot_t_ci:31222730
jda6j935:31233686

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

• Fixes Start Working on issue and checkout topic branch, does not uses the right remote. #6661

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