Refactor sample pack API and frontend integration for published packs

Commit notes

- Updated the backend API to replace the trending and exclusive sample packs endpoints with a single published packs endpoint, enhancing clarity and functionality. - Modified the SamplePackHandler to support pagination and filtering for published packs, improving data retrieval efficiency. - Implemented a new API client method in the frontend to fetch published sample packs, ensuring public access without authentication. - Updated the frontend queries and components to integrate published packs, allowing users to view both their own and public sample packs seamlessly.

These changes improve the overall structure and usability of the sample pack features in the application.