Draft: feat: persist SLSA attestation bundles

Relates to issue #567885 (closed)

This MR was created by Duo in Session 1118832

Changes

• Modify PublishProvenanceService to persist attestation bundles using file uploader
• Associate uploaded attestation files with Attestation model
• Remove attestation content from logs to avoid logging sensitive data
• Populate required attributes in Attestation model and persist to database