Add mandatory instruction reference requirement, guide AI agents to copilot-instructions.md, reorganize code snippets, and promote GitHub Copilot#2401

fadidurah merged 6 commits intofadi/nov25aiAzureAD/microsoft-authentication-library-for-android:fadi/nov25aifrom

copilot/update-copilot-instructions-fileAzureAD/microsoft-authentication-library-for-android:copilot/update-copilot-instructions-fileCopy head branch name to clipboard