Display import source data on documents (#6651)

* Display import source in Insights

* Ensure sourceMetadata is not returned on public requests

* Support createdByName

* Prefer display source name

server/queues/tasks/ExportJSONTask.ts

@@ -125,6 +125,7 @@ export default class ExportJSONTask extends ExportTask {
           title: document.title,
           data: DocumentHelper.toProsemirror(document),
           createdById: document.createdById,
+          createdByName: document.createdBy.name,
           createdByEmail: document.createdBy.email,
           createdAt: document.createdAt.toISOString(),
           updatedAt: document.updatedAt.toISOString(),