Pattern-based error suggestions for Azure errors

[JeffreyCA]

Enhanced ErrorWithSuggestions

[spboyer]

Implemented in PR #6827 which introduces a full YAML-driven error handling pipeline. Error rules in error_suggestions.yaml are matched against errors via typed struct matching (reflection + DFS traversal) and text patterns. The pipeline covers soft-delete, quota, auth, location availability, PowerShell hooks, Bicep, template validation, and more. Custom handlers support dynamic suggestions (e.g. querying ARM for available regions).