Throws an Error when used without Git

**Describe the bug**
When using a VCS like JJ, the extension crashes with "Unable to Connect to the GitHub API, please check your internet connection."

**To Reproduce**
Steps to reproduce the behavior:
1. Put `git.disabled` in your .vscode/settings.json
2. Open actions pane

**Expected behavior**
It shouldn't require the Git extension, only provide optional features (like current branch).

**Screenshots**
```
2025-03-14 12:38:40.980 [error] Error: Git model not found
at s.getAPI (/Users/dukese01/Applications/Visual Studio Code.app/Contents/Resources/app/extensions/git/dist/main.js:2:805076)
at new _d (/Users/dukese01/.vscode/extensions/github.vscode-pull-request-github-0.106.0/dist/extension.js:2190:26346)
at Function.createProvider (/Users/dukese01/.vscode/extensions/github.vscode-pull-request-github-0.106.0/dist/extension.js:2190:26938)
at gw (/Users/dukese01/.vscode/extensions/github.vscode-pull-request-github-0.106.0/dist/extension.js:2190:32572)
at kf (/Users/dukese01/.vscode/extensions/github.vscode-pull-request-github-0.106.0/dist/extension.js:2526:6481)
at G4 (/Users/dukese01/.vscode/extensions/github.vscode-pull-request-github-0.106.0/dist/extension.js:2526:7586)
```

**Extension Version**
`v0.27.1`

**Additional context**
Feel free to close as wontfix, I know this isn't exactly the recommended workflow :)
As I think about it, can you even figure out the connected repo without Git? IDK.

Reproduce the crash by setting git.disabled in .vscode/settings.json and opening the actions pane. Trace the extension startup path that creates the Git-dependent provider, then verify that the actions pane opens without the Git extension while optional features such as the current branch can be unavailable.

Written by the indexing model from the issue text.