Source Control is stuck in 'scanning folder for git repository', fix found

### Is there an existing issue for this?

- [x] I have searched the existing issues

### OS/Web Information

- Web Browser: Chrome
- Local OS: Macos
- Remote OS: Debian 12
- Remote Architecture: x86
- `code-server --version`: 4.117.0 and more

### Steps to Reproduce

I have been using version 4.100.3 all along, and today I tried to update to version 4.117.0 (npm install) code-server@4.117.0 --unsafe-perm ）， After the update, it was found that the Source Control has been stuck in "scanning folder for git repository".

### Expected

Source Control should show something

### Actual

I searched for @ builtin git in the extension and found that the git extension is not active.

I found the relevant logs in the 'Issues' window:
```
2026-05-21 01:11:21.601 [error] Activating extension vscode.git failed due to an error:
2026-05-21 01:11:21.601 [error] Error: Cannot find module '@vscode/fs-copyfile'
```

I also tried switching between 4.116.0 and 4.117.0.
I am trying to install `npm install @vscode/fs-copyfile` and reload window, and in the end it was fixed.

So was `@vscode/fs-copyfile` lost in the default installation?

### Logs

```shell

```

### Screenshot/Video

_No response_

### Does this bug reproduce in native VS Code?

Yes, this is also broken in native VS Code

### Does this bug reproduce in VS Code web?

Yes, this is also broken in VS Code web

### Does this bug reproduce in GitHub Codespaces?

Yes, this is also broken in GitHub Codespaces

### Are you accessing code-server over a secure context?

- [ ] I am using a secure context.

### Notes

_No response_

首先比较 4.100.3 和 4.117.0 的安装或依赖配置，重点确认内置的 vscode.git 扩展是否包含 @vscode/fs-copyfile。复现缺少模块的错误，然后验证全新安装能够激活 Source Control，而无需手动安装该包。

由索引模型根据 Issue 内容生成。