Show attachment download progress, new stop button to cancel

Co-authored-by: Jamie Kyle <jamie@signal.org>

ts/components/conversation/TimelineMessage.tsx

@@ -221,10 +221,7 @@ export function TimelineMessage(props: Props): JSX.Element {
       // check if any attachment needs to be downloaded from servers
       for (const attachment of attachments) {
         if (!isDownloaded(attachment)) {
-          kickOffAttachmentDownload({
-            attachment,
-            messageId: id,
-          });
+          kickOffAttachmentDownload({ messageId: id });
 
           attachmentsInProgress += 1;
         }