Cleanup Workbook Artifacts Post-Audit Report Submission

[sambodeme]

This ticket is a follow-up to ticket #3571 and the development team discussion (Dev Huddle) on April 17, 2024. The goal is to ensure that all workbook artifacts uploaded by a user during the submission process are removed upon the successful submission and dissemination of the audit report. The tasks include:

• [x] Implement logic to automatically remove workbook artifacts once the audit report is submitted and disseminated.
• [x] Develop a Django command to remove workbook artifacts from reports that were submitted previously.
• [x] Modify the code to prevent the saving of workbook artifacts each time users download from the disseminated reports view.

[sambodeme]

@danswick for awareness

[danswick]

Open question about when we should delete these artifacts. Will discuss during dev huddle this week.