refactor: streamline dataset creation payload by removing data wrapper

Created by: deepakduggirala

1. Removed the previously added data wrapper in payload creation, as it conflicted with the worker code.
2. Moved name formatting and sanitization to the UI layer, since the worker relies on the slugify method for name sanitization, and the watch script expects sanitized names to align with those in the database. This ensures no further modifications occur at the API level.