Allow Bulk Deletion of Feedback Posts

Description: As an active user of Sleekplan, I need the ability to bulk delete feedback posts to streamline managing imported data. Problem: Currently, deleting feedback posts is cumbersome when needing to clear many posts at once, especially after performing an import and requiring adjustments. Benefit: Streamlining the deletion process would save time and enhance user experience. It would reduce manual effort and make data import management more efficient.