Make Copilot Autopilot request-error retry count configurable

### Describe the feature or problem you'd like to solve

Essentially what's proposed here: https://github.com/microsoft/vscode/issues/313485

### Proposed solution

_No response_

### Example prompts or workflows

_No response_

### Additional context

_No response_

The issue names no files or tests; start by reading the linked VS Code issue and locating the Copilot Autopilot request-error retry handling in this CLI. Done means the retry count can be configured and the configured value controls retries after request errors.

Written by the indexing model from the issue text.