Hide unpublished and hidden docs in Slack alert

The trust center access-request Slack notification listed every document
referenced by a document access, including drafts with no published
version and documents whose trust center visibility is NONE. Skip those
so the message only surfaces documents a requester could actually be
granted.

Signed-off-by: Sacha Al Himdani <sacha@probo.com>

pkg/slack/slack_message_service.go

@@ -354,6 +354,10 @@ func (s *Service) loadDocumentsReportsAndFilesFromAccesses(
 				return nil, nil, nil, fmt.Errorf("cannot load document: %w", err)
 			}
 
+			if doc.CurrentPublishedMajor == nil || doc.TrustCenterVisibility == coredata.TrustCenterVisibilityNone {
+				continue
+			}
+
 			documents = append(
 				documents,
 				SlackMessageDocument{