Add documentation for reviewing GitHub Copilot authored PRs

[Copilot]

This PR adds comprehensive documentation on how to review pull requests that have been authored by GitHub Copilot.

Summary of changes

• Created a new guide docs/REVIEWING_COPILOT_PR.md that provides a step-by-step process for reviewing Copilot PRs
• Added documentation that covers:
  • Introduction to what Copilot-authored PRs are
  • Prerequisites for reviewing these PRs
  • Detailed steps for opening PRs and starting reviews
  • Instructions for using the "Review in codespace" feature
  • Guidelines for setting up the environment (including installing the Azure CLI)
  • Commands for building Innovation Engine with make build-ie
  • Procedures for running tests to verify changes
  • Best practices specific to reviewing AI-generated code
  • Common issues to look for in Copilot-authored PRs
• Updated CONTRIBUTING.md to reference the new document and added a new section in the Table of Contents

This documentation will help contributors effectively review PRs created by GitHub Copilot, ensuring that AI-generated code meets the project's quality standards before being merged.

Fixes #262.

[!WARNING]

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• cdn.fwupd.org
  • Triggering command: /usr/bin/fwupdmgr refresh (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.