Rejecting a tool call aborts the conversation

### Describe the bug

When I reject a tool call it aborts the whole conversation. This is annoying especially for longer threads, when a single tool call shouldn't affect the overall progress.

### Affected version

GitHub Copilot CLI 0.0.411-0

### Steps to reproduce the behavior

Prompt:

```
Introduce yourself, get the contents of the parent folder, then say what 2+2 is
```

Reject the tool call.

This is just a simplistic example but it proves the point. I noticed this behavior on a larger task for which Copilot had no reason to check the contents of the parent folder. After rejecting the tool call, I saw that the whole conversation was aborted.

### Expected behavior

Copilot introduces itself, then answers what 2+2 is.

### Additional context

- macOS
- Warp
- zsh