fix: Fix attachment uploading issue caused by ES2022 spread operator

Per ES2022, keys with undefined values are applied via the spread, overwriting any existing value.  This impacts us here because `attachment` has optional `name` and `path` fields.  So need to take care to only apply them when they exist.

packages/backend/src/resolvers/attachment.resolver.ts

@@ -59,10 +59,10 @@ export class AttachmentResolver {
       const mimeType = await getTypeAsync({ fileName: file.filename, stream });
 
       return {
-        name: file.filename,
-        path: file.filename,
+        ...attachment,
         mimeType,
-        ...attachment
+        name: attachment.name ?? file.filename,
+        path: attachment.path ?? file.filename
       };
     } catch (error: any) {
       logger.error(error);