Refactor sample pack queries in Sequencer and SampleManagementProvider

Commit notes

This commit updates the Sequencer and SampleManagementProvider components to replace the use of `useSamplePacks` with `usePublishedPacks`, ensuring that only published sample packs are loaded for the sequencer. The changes streamline the data fetching logic and improve the handling of loading and error states related to published packs, enhancing overall user experience and data integrity.