[turbopack] Add user friendly names to trace labels (#80388)
# Enhance Layer Names with User-Friendly Descriptions
This PR improves the developer experience by enhancing layer names in Turbopack with user-friendly descriptions. Instead of just using internal identifiers like "app-client" or "app-rsc", the PR adds descriptive names like "Client Component Browser" or "Server Component" that better communicate the purpose of each layer to developers.
Key changes:
- Created a new `LayerName` struct that contains both the internal name and an optional user-friendly description
- Updated all layer references throughout the codebase to use this new structure
- Changed error message text from "Example import trace(s)" to "Import trace(s)" for more simplicty
These changes make error messages and debugging information more intuitive, helping developers better understand which part of the application is experiencing issues.
