Add GitHub Copilot Commit Message Generation Support on Linux

[mirzahaseebIM]

The feature request

Currently, GitHub Desktop on Windows includes a feature that allows users to generate commit messages using GitHub Copilot, as shown in the screenshot below. This feature is very useful for improving commit quality and saving time by automatically suggesting commit titles and descriptions based on the changes.

However, this functionality is missing on Linux GitHub Desktop. It would be great to have parity across platforms so Linux users can also leverage AI-assisted commit message generation.

Proposed solution

• Improves productivity for developers using Linux.
• Ensures feature parity across Windows, macOS, and Linux.
• Encourages better commit practices and consistency in messages.

Additional context