regression: `$group` by `alias + type` instead of full `$source` object on reports page (#30391)

apps/meteor/ee/server/models/raw/LivechatRooms.ts

@@ -357,7 +357,10 @@ export class LivechatRoomsRawEE extends LivechatRoomsRaw implements ILivechatRoo
 				},
 				{
 					$group: {
-						_id: '$source',
+						_id: {
+							type: '$source.type',
+							alias: '$source.alias',
+						},
 						value: { $sum: 1 },
 					},
 				},